Sweet, looking forward to it

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Saw this at a video store near me and have been tempted to try it out to see if it's worth buying. What is the gameplay like long term? i.e. will I still be playing it a week after buying it or will the fun be over by then?
Re: Wii library.
Yes, the selection often seems filled with a bunch of ****, but a little bit of investigation of the game you want to buy goes a long way; These are ones I've enjoyed greatly so far:
Red Steel
Mario Kart
Dead Rising (what I'm hooked on ATM)
Super Mario Galaxy
Super Paper Mario
Metriod 3
Twilight Princess
Zack and Wiki - A little kewtsie but still fun.
Star wars - The Force Unleashed - wasn't the best but at least it kept me interested til the end.
Resident Evil 4 - Even though it's sometimes a bitch to aim or try to run away.
WWE raw vs smackdown 2009 - probably more fun as I'm a WWE fan

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Wii Fit (don't judge me ;D)
Ones I've tried and didn't get into...
Monopoly - rented this out and it sucks. I think mostly because I enjoyed this as a child cos stealing from the bank was half the game

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Big Beach Sports - boring
Super Smash Bros Brawl - bring on the flames now, but I tried this and it just didn't hook me. Keep in mind as a kid I was addicted to SSF2 and MK.
Yes the pickings seem small but recently it's a lot better.