Pros:

Educational in witch cr0wning.
Taught me a lot of ways to cr0wn a witch.
Obviously a lot of effort put into the campaign
Awesome jump-scare
I like how you can choose how it ends on the last chapter, but personally I always go fight Alexis, so I don't actually know what happens if you just try to escape.
Convincing custom animations

Cons:

If you die on the first map you have to watch a long cutscene again.
In the intro cutscene the scientist who swivels the chair around to look through the window's foot clips through the wall a bit.
If you walk into the elevator and walk back to where the doors close, the doors will close on you and you will teleport to the nearest bot survivor, and be unable to progress due to the elevator going up and you being downstairs.
No portal gun :(
Introduction of the zombies seems nonsensical, as there are dead researcher bodies lying around. If they turn into zombies, why are some lying around still?
Jumpscare was good, but I feel it should have more of a sense of you needing to deal with the jumpscare zombie rather than it just sitting there doing nothing while you watch it. That'd be more terrifying.
Personally I didn't like how when people talk captions appear above the screen. But that's probably just me.
On the third map, where did the survivors come from?
The ending is practically impossible, if you go down theres practically no opportunity to get revived, and the horde never lets up enough for you to have a chance to snipe the cores. I ended up having to use the bots as a meat-shield while I sniped the cores.
When I finally got to the end, Francis had died. During the end cutscene however, Francis was still alive for some reason.

Conclusion:

Obviously a lot of effort has been put into this campaign, and despite there being more cons than pros, I like it overall.
I'd definitely change the "Fight Alexis" end, to make the horde stop every now and again to give time to destroy the cores.