Oh that hardcore gamers favourite Just Dance 4!
I already fell for the Nintendo trap and brought my girlfriend a Wii it's not been used in over a year now. I think either Drags or Jman said get a kinect instead. I regret not listening to them.
That's your fault for being too tight to buy any games to go with it lol. There are plenty of good quality Wii games that will appeal to both the casual and hardcore gamer. Super Mario Galaxies 1 and 2, Mario Kart, Super Smash Bros. Brawl, Metroid Prime Trilogy, Zelda Twilight Princess, Zelda Skyward Sword, Punch Out, Sin and Punishment 2, New Super Mario Bros. Wii, Xenoblade Chronicles, Pandora's Tower and The Last Story from Nintendo alone. If you haven't played all of those games then you're missing out.
Then you've got a wide range of exclusives from third parties - Cursed Mountain, Deadly Creatures, Silent Hill Shattered Memories (although that is available on the PSP and PS2 as well), Mario and Sonic At The Olympics, de Blob, Resident Evil Umbrella Chronicles, Resident Evil Darkside Chronicles, Dead Space Extraction, Trauma Center Second Opinion, Trauma Center New Blood, Trauma Team, Madworld, Manhunt 2, Rayman Raving Rabbids 1, Fatal Frame 4, House of The Dead Overkill, Red Steel 2 and Muramasa Demon Blade.
Then you've got a few multiplatform games that are a better experience on the Wii such as Godfather Blackhand Edition, Guitar Hero, Pro Evo and Tiger Woods.
If you or your girlfriend haven't played all of those titles then you're both missing out on some real quality gaming.
And that's before you take Homebrew and the plethora of emulators available into account.