LOL I agree that you are rooting for them to get killed though disagree with your example I really loved The Cabin In The Woods.

The girl running that always falls down, and can't seem to get up.

The smart ass tough guy is the first to go.

The nonchalant unaware people that don't see that the killer is standing right behind them.

People that insist on sticking their head in holes they shouldn't.

The old crippled slow moving partially decomposed undead guy that always catches the 19 year old track star that got a huge head start.

I also hate how a teenager can beat this impossible villain somewhat simply.

My pet peeves:

Unrealistic emotional responses from the characters.

Characters making really poor and illogical decisions, over and over.

Not cutting off the monster's head when it's down.

Dropping the weapon after the monster falls down.

Staying in the house/hotel/etc. after it has become apparent that it is haunted/monster-infested/etc.