There is an official thread for these questions:
http://www.wiichat.com/nintendo-wii-...-buy-rent.html
Since you've already started this thread I'll answer anyway. The only really good game you listed is Brawl. Wii Play isn't worth getting even though it's only $10 more than buying a remote separate (new ones come with remotes, used copies without the remote are a scam, IMO). Mario Party and Olympic Games, some people like but the reviews aren't very good. And they're more party games, they won't be as fun without other people.