*MANHUNT 2!!! it´s extremly violent, and Wiimote makes it a lot more than other systems were released.
*The house of the dead 2 & 3 returns
*No more heroes, Usa release, European version it´s censored.
*Samurai Warriors: Katana
*Bleach!!!
*Battalion Wars 2
*Fire Emblem, radiant dawn

If you got it for enought time, just play:
*House of the dead overkill
*Madworld
*Tenchu 4

Most of the suggestions in this thread are must plays.

If you wanna waste another 30+ hours I say go for Tales of Symphonia: Dawn of the New World. =D

Do you just use the wii mote for the light gun?  How exactly does that work?

Dont trade it you idiot...

Yup. The Wii remote by nature is a pointing type device, so you just aim with the controller as if it was a gun. The trigger style B button works well for this. If you want more accuracy, I reccomend the Nyko Perfect Shot accessory - looks like a white Glock 9mm. Really fun for the light gun games, gives a very arcade feel.

diden't u get wii sports from ur cousin aswell? coz thats the first game i would play

I actually forgot that game at his house, I need to go pick it up.  Thanks for reminding me!  I have played it at his house several times.

DAMNDL0SER, just take the Wiimote as a TV controller, aim with it and generally shoot with A or B butoms. Wiizapper or similar accesories only are to make more comfortable and give more precision, I never needed that, but wiimote it´s the perfect controller for FPS games combinated with Nunchuck, play COD5 with this controller it´s shocking.

if it hasnt been said try Loz:TP Metroid 3 and SSBB with youridea of galaxy, Mario KArt is also very fun.

Legend of Zelda: Twilight Princess

Metroid Prime 3: Corruption 

Resident Evil: Umbrella Chronicles

Super Mario Galaxy

Super Smash Bros. Brawl

Mario Kart Wii

Tales of Symphonia: Dawn of the New World

are the only truly excellent games released for Wii so far.