WiiPlay is pretty silly. I played it the first couple of days when i first had it. & then forgot about it. But you do get an extra wiimote, basically you pay 10 dollars for the game.
Carnival Games was the same way. I play that occasionally. But not lately.
I don't have Link's Crossbow Training & haven't paid much attention to it so that on i can't help you with.
It really just depends on what games you like. I've had a lot of fun with Resident Evil - Umbrella Chronicles. That game is a two player, an on rail shooter. I've also had a lot of fun with Tiger Woods PGA Tour 08 & i don't even like golf. Up to 4 people can play that. Guitar Hero is pretty addicting. They aren't selling seperate guitars as of yet but you call play online with other people & at the end of the month you'll be able to purchase an extra guitar seperate.