these guys have some fair reviews...anything 4+ is decent IMO
http://wii.ign.com/index/reviews.html
best games IMO so far:
Metal of Honor Heroes 2 - excellent shooter. good use of nunchuck and remote. need a gun case for this one
Madden NFL 08 - you actually have to go through the motions like your are playing. remote forward to throw, both nunchuch and remote up to catch, etc.
The Bigs - decent for baseball. much better than the sport's one. timing is a little off on hitting but you get used to it.
Excite Truck - just a fun offroad racing game. easy to play for just about all ages.
Guitar Hero III - definitely not like the real thing but decent enough to enjoy playing. builds hand coordination. takes getting used to initially.
Harry Potter and the Order of the Phoenix - huge world to explore. intuitive uses of the remote for casting spells
Zelda - need i say anymore
Links Crossbow Training - good all around shooter
Scarface the World is Yours - I think they say just about every curse you can in spanish and english...shooter type of game
Super Mario Galaxy - let's just say it's out of this world ***
Like said before, Tiger Wood's Golf is good also as well as Lego Star Wars
Trauma Center - when else could i get to play surgeon?!?!
Wairio Ware - fast pace - decent use of moment on controller
Wii Sports of course - my 5 year old niece has the high score on bowling at 214. even my 80+ year old grandmother plays it.
Zack & Wiki: Quest for Barbaros Treasure - long movie scenes but a good adventure game for multiple ages. more of directing the players as opposed to actually playing them. well thought out.
i'd like to try SSX Blur, the new Smackdown Wrestling, the Godfather, Resident Evil