I hate endless enemy respawning. nothing kills my enthusiasm for fighting a horde when there is. no. end.
Ever.
I like to 'clean' out an area, it just makes me feel better knowing that if I return, my efforts to rid the area of said hostile organisms will not be in vain.
I love Zombies. The gorier and more deformed/rotting, the better. I want them to
want to eat me, and there should also be a risk that they might infect you. The idea of your character turning into a Zombie is just too cool. Especially if you can still play the game, but now the living characters (allies and non) try to kill you too. Only thing being, is that you get all of the vunerabilities of the Zombie and can't use many items anymore, save weapons.
I love Star Wars games, especially when you get to play as a Force-User. However, I Hate cannon-fodder Sith/Jedi that are too dumb and not hard enough. I want any Force User that I come across to be able to kick the crap out of me, and not have to go to the Sith Lord/Sith Master difficulty levels to have them do this. If I had a difficulty level for them that I could choose, it would be that of the common sword-wielding ninjas from Ninja Gaiden. They were hard, even on the lowest difficulty level, but ohhh man were they fun.
I dislike linear levels. Not only are they boring, but they don't really let you explore either, which kills a lot of replay value. What fun is replaying a game when you are simply going from point A to B to C, and you can't deviate much? Plus too many fake 'doors' on a level that never open don't make an area seem bigger, they just imply a developer got too lazy to develop any more spaces. It makes the area seem 'bigger' to have all those extra developed rooms.
Lastly, in a Star Wars game, I like seeing refreshers (bathrooms). It says that the people in Star Wars use the potty too, unlike those in Star Trek.