Trivia Murder Party: Excellent if you like trivia, lame if you don't.
Role Models: Only play this with close friends you know well. Has high potential to make people uncomfortable.
Dictionarium: Usually decently funny regardless of improv skills.
Joke Boat: Heavily relies on being witty. If you and your friends are bad at that, avoid this one.
Press the Button: Very unbalanced. Leads to some funny situations, though.