I'm basically thinking of "sometimes" vs "never" here. For instance, Fluxx is pretty quick, so you can play it while you're waiting for food to cook, whereas Munchkin takes a lot longer. On the other hand, there are some games that I haven't played in about 10 years (e.g. Risk); if nobody else is interested in playing them, it might make sense for me to turf them out.
Board games
Monopoly
0(0.0%)
Cluedo
0(0.0%)
Risk
0(0.0%)
Pictionary
0(0.0%)
Trivial Pursuit
0(0.0%)
Party Scrabble
0(0.0%)
Card games
Magic the Gathering
0(0.0%)
Munchkin
0(0.0%)
Fluxx
0(0.0%)
Chez Geek
0(0.0%)
Top Trumps
0(0.0%)
Killer Bunnies
0(0.0%)
Pit
0(0.0%)
Normal deck of cards (e.g. Whist)
0(0.0%)
Other games
Operation
0(0.0%)
Up a Bit
0(0.0%)
Chess (not exactly a party game!)
1(33.3%)
Apple bobbing
0(0.0%)