Found it really entertaining film, immersive. I agree that perhaps the monster was disappointing to see. Would rather not see it as much as you do.
Can't say the camera work bothered me too much - ocassionally wished it was filming what I wanted it to (or what a 'normal' film would show). Didn't feel anything for the characters, particularly, apart from Hud.
The ending clearly perplexed half of the cinema though - a lot of looks across at one another and a few commented on how short it was, or 'was that it'. A few geeks, such as myself, took the hint that the lights didn't come on for the credits as normal (or because they'd read online), to see the end of the credits.
It's not an amazing film, and I suppose it would be nice to understand more having watched this account of events - which was actually very good. It really dropped you in on a terrorist attack/warzone/monster attack. It'll also make for a very interesting DVD release, complete with 'extras'.