When my friends come over, we usually play smash, mario kart, guitar hero and boom blox. Can you guys recommend me some other good multiplayer games?

Games that we tried and (got tired/did not like):

Wii sports

Wii play

Wario Ware: Smooth Moves

Anything else you guys like?

BooM BLoX!

Mario Strikers Charged

Welll, You kinda already said all of the good ones, but anyway:

4-Player:

Red Steel (Great with 4 player mission mode)
Mario Strikers Charged
Marvel Ultimate Alliance
Mario And Sonic At the Olympic Games (Maybe, cuz it's kinda like WiiSports)
Rayman Raving Rabbids (I have the 1st one. I've heard it's better than the 2nd)

Only 2 Player:

Bleach: Shattered Blade
DBZ Budokai Tanchaichi (2 or 3, I only have 2. 3 is def. better though)
Excite Truck
Link's Crossbow Training (Zapper game)
House of the Dead 2 & 3 Return (If you're into classics, but I reccomend a rent)

Stay away from Mario Party 8.

The ones you mention are the best, maybe you'd like to try the first Rayman Raving Rabbids

I just wish Capcom develops a Power Stone game for wii...

i play SSBB with friends, and we are playing like maniacs!! :P

also Mario Kart Wii, maybe Wii Sports (rarely) and also Rayman Raving Rabbits 2 which is really crazy game! :P

also, DragonBall: Budokai Tenkaichi 3 which again we are playing like maniacs!

Thanks a lot guys. Actually, we used to play Strikers also, but not everyone likes it.

We alternate the games a lot because people have different tastes. Some people only like one game and I wanted a change for when they got bored. :)

Both Red Steel and Rayman Raving Rabbids are good for a party and you can find them both dirt cheap.

Resident Evil : Umbrella Chronicles