Pros:

Excellent campaign
A good challenge
NEW MELEE WEAPONS

Cons:

A few glitches here and there
New melee weapons look a bit buggy, but I was just too happy that they were there
Almost too difficult, I couldn't finish the campaign thanks to the pair of tanks

Conclusion:

A very fun campaign, I had a great time with the new weaponry 
It seemed a bit hard to follow, but thankfully I enjoy that
I'd recommend easing up the finale a bit, but apart from that I think it had a really good difficulty setting

Pros:

Fun map, stays true to the Half life version for the most part
Well placed items-- and fun for Half life players when you find the lambda symbols

Cons:

A few AI bugs, such as a bot spontaneously getting incapped shortly after the second saferoom  (at the ladder)
Smoker's Paradise-- the high roofs make it hard to get a good shot for the AI when you get wrapped

Conclusion:

Fun map, I'll recommend it for my friends-- maybe they'll be better with those smokers...