All right. Finally got around to finishing the demo and everything.
---CRITICISM/COMPLAINTS---
Enemy gun damage is far too high, in my opinion. I found myself dying a lot on the 2nd level, only to reload it and have it crash. I think it wouldn't be as bad if teammates actually did something. They fired a single bullet in my entire playthrough.
After I activated the radio to kill the tank, I turned around to exit the house and there was a massive FPS drop.
I noticed some sounds and music were ripped from BC2 (mainly the 636C's gunsound, and Russian chatter and death sounds)-- or you just replicated them extremely well, but I'm going for the former.
In level 2, all teammates are the same model.
There were many instances when I was jumping and I would rocket into the air (though this is a bug with FPSC in general, this could probably be fixed with invisible ceilings).
The voice acting could use a LOT of work, especially in the final cutscene.
In the first cutscene, right before the sniper rifle is zoomed in, an ammo counter can be seen.
Teammates were practically useless.
Not a fan of the bloom.
Many walls that can be scaled to glitch onto the top of the level, thus skipping enemies, etc.
When the objective text is onscreen, the player is unable to switch weapons.
An indication that you've picked up new weapons would be nice.
---PRAISE---
The level design was rather good. Great job of funneling the player in the right direction, but still looking like it's an open town.
The tank scene was particularly well done. The explosions were very nicely done, as well as the tank's destruction itself.
I was pleased to find that I was rewarded for exploring nooks and crannies. I found a few spare sniper bullets behind some boxes that were off the set path.
I think the entity placement was done very well and believably.
---CONCLUSION---
While I do have more criticism than praise, I do not dislike the demo. It definitely has potential, but just isn't there yet. There is a lot of room for improvement, and I'm sure you're already improving a good amount of my crits. I'm looking forward to more progress on the game.
Cheers

Cheesehead for life.