Pros:

Reworked Animations.
Compatible with skins that affects the default Coach.

Cons:

Two-handed melee weapons don't appear in his hands. (Before 2.1 Beta)

Conclusion:

For anyone who wants to make Coach look more professional. Grab this!

Pros:

Finally, a campaign set in the UK!
High quality, well detailed maps.
Were-Tanks!
Scary sounds on map 4!
Atmospheric Music.
Loved the "Turn off the Music Event" on map 2!

Cons:

The hordes are too frequent after you go underground on Map 4 ("The Old Stag")
Finale event is a tad too short.

Conclusion:

Finally, after years of waiting for a custom campaign to be set in the good ol' UK, there is one. And it makes me feel more at home! For any UK residents that love killing zombies, download this!

Pros:

Longest campaign I've ever played (6 maps total!)
High quality, extremely long maps.
Some maps are non-linear.
Very challenging, even on Normal difficulty.
Heard some DOOM3 over the radios on the School Finale level!

Cons:

Conflicts with some weapon mods. But I removed them from the VPK and repacked it. (before 1.05 patch)
Took me over 3 hours and nearly 8,000 dead Zombies to finish on the first try ;)
No Grenade Launchers. (I couldn't find any on the 1st playthrough)
Near-endless hordes (before 1.05 patch)

Conclusion:

For those who like a good challenge. Download this!

Pros:

A bullpup Sniper Rifle!
Highly detailed.
Very good animations

Cons:

3rd person animations are all wrong, because the magazine is behind the trigger. (Not your fault)
Reload is too fast.
No HUD icon

Conclusion:

I'm at a loss for words on how to describe this piece of work! The reloading animation was a bit slow, but now it's too fast. but I've learned to deal with it.

Pros:

The best part of your Improved Single Player Mod!
Makes the bots more useful.
Good during hordes and finales. So you can make the bots hold their ground.

Cons:

Requires turning the cheats on, so you can use keybinds to tell bots to hold fire, sneak or hold position.
Can only play it on Normal :(

Conclusion:

I combined the bot command along with Weapon Realism Mod, and it was very good. It was good given the fact you tell bots to hold fire, sneak or hold position. 

Pros:

M4's German counterpart!
High quality (As usual.)
Well detailed
Good sounds
Reloading animation is top-notch!

Cons:

Cons? What cons?

Conclusion:

Now this is one badass looking rifle, Herr Doktor! The reloading animation is a tad slower than the M4A1's. But this one seems to fit the weapon absolutely perfectly.

Pros:

A nice vintage shotgun.
High quality.
Made by the legendary John Browning!

Cons:

Wood texture could be made a little more realistic. Other than that, nothing else.

Conclusion:

Nice work as usual, Herr Doktor!

Pros:

It's an FN FNP!
High quality!
Perfect animations
Made by the same company that gives you the SCAR Assault Rifle!

Cons:

Why should I say anything bad about it?!

Conclusion:

A very high quality piece of work. Everyone should have one of these!

Pros:

High quality!
Looks better than an M16!
Like the part on the magazine, you can see the bullets!
Laser sight problem has been fixed.
Animations are sweet!

Cons:

Gun "stands up" when you drop it.
No crosshair on the holographic sight. (I won't take points off for that.)

Conclusion:

It's hard to tell which rifle I like better, an M4A1 or an HK416. If you do decide to make another rifle, do a CAR-15!

Pros:

High quality
Love the Two-tone effect
It's an M93 Raffica! (Meaning 'burst fire' in Italian)

Cons:

Doesn't fire in 3-round bursts. (No points deducted. As there's nothing you can do to fix that.)

Conclusion:

A very nice looking Machine Pistol. I've even set mine up so that it's the only primary you can use while incapacitated!

Pros:

SCAR-H instead of SCAR-L!
Extremely well detailed.
Replaces M16A4 as my preferred rifle
AN/PEQ-2 Sight.
Beautiful reloading animation. SCAR-L takes too long, this one cuts it in half.
Now has an optional black/tan skin included!

Cons:

Why should I say anything negative about such a beautiful piece of work?!

Conclusion:

If there are any fanatics that like SCAR-H's over the SCAR-L. Then download this. Trust me, you won't regret it. Something tells me that the bolt-pull reloading animation doesn't fit with this weapon (I liked the old one better)

Pros:

Great looking Machine-Pistol
Highly detailed
Good reloading animation
Behaves like the real-life G18 (only used with the G18 script, as a separate download)

Cons:

Why should I say something bad about it anyway?!

Conclusion:

Very nice. Looks like it came out of Modern Warfare 2. But this one is better!

Pros:

Bots are more intelligent. (To a degree)
Bots use melee weapons.
Bots can lead.
Game still continues even after you've been killed.

Cons:

Bots move too far ahead of you.
Bots don't attempt to avoid the Witch and instead run into her, startling her.

Conclusion:

A good bot upgrade. If you can tell me how to reduce the distance on how far the bots can move ahead of you, I'll rate this even higher.

Pros:

More realistic.
Animated!

Cons:

What's not to like about it?

Conclusion:

I'm certainly having this! Looks a lot better than the stock defibrillator!

Pros:

More realistic.
Tons of detail.
Has a more metallic look. Doesn't look like cheap plastic.
My favourite Assault Rifle. (M4A1 is basically a shorter M16. I like M4A1's & M16A4's better than M16A2. I maybe British but I love American weapons!)
Now has arby26's new M16 Animation

Cons:

Cons...? what cons?

Conclusion:

With my favourite rifle in Left 4 Dead 2. Those zombies are gonna be dropping like rain! A must-have for all the M4 lovers out there!

Pros:

Fixes almost all of those irratating clipping bugs with melee weapons and many others for L4D1 Survivors.
No longer clips through the Magnum pistol.

Cons:

Breaks compatibility with the Zoey 'Lightning' mod. (Which I won't take points off for.)
Melee weapons sometimes clip through their hands.

Conclusion:

Finally. Those aggravating clipping bugs with L4D1 Survivors have been sorted (mostly). Makes me want to play L4D1 campaigns more now!

Pros:

Better animations
Better walking animation
More likely to use the weapon

Cons:

None.

Conclusion:

A must-have! Laser sight was a problem, but it isn't now.

Pros:

Better viewing angle. (You see more of the weapon)
Better walking animations
Better reloading animation

Cons:

No helping hand/item grab animation

Conclusion:

I'd definately recommend this mod. Valve's anim's get boring after a while, so this is a must have! I'd suggest putting the helping hand/item grab anims' back in. Because not doing that undermines your amazing animations.

Pros:

One of my favourite handguns.
Awesome animations.
Doesn't replace the Magnum pistol.

Cons:

Dual-wielded M92F's look a bit too close together.  (It could be that I use widescreen resolutions.)

Conclusion:

Putting my favourite pistol in L4D2 reminds me of when I used to do the same for HL2.
Very nice!! If you move the dual-wield version a little bit further apart, then I will definately give this a perfect score!