Can't say I regret any of my buys.
-Resident Evil 4 Wii Edition, cheap price and good controls..worth the money.
-Resident Evil Umbrella Chronicles, good game and interesting take on the series.
-Super Mario Galaxy, my favorite game of 2007.
-Legend Of Zelda: Twilight Princess, first game when I get my Wii, amazing game.
-Metroid Prime 3 Corruption, great game again, lots of fun with that one.
As for people complaining about Metroid and online stuff. Honestly online would not work for that game, at least not in the Prime series. And if you didn't like the single player mode, thats fine. You just should of rented it then rather than buy it is all.
Reason I don't regret buying my games mainly is I know what interests me as a gamer, and if something is new or I am not sure about it I read reviews or give it a test run (rented a lot of games). Saves me money, and lets me play the really good games Wii has to offer. More people should do the same so they don't regret their purchases.