The solution is to rent games, and Wii games for rent online are a great idea.  We like to use GameFly, as they ship fast, have just about every game for every platform, and you can keep them as long as you want for a flat fee, just like movie rental service Netflix.

There have been several times when we've rented a game and hated it so much we sent it back the next day - thank goodness we didn't pay an arm and a leg for something touted as the latest and greatest, but that really stunk.  Within a week, our next game selection was on its way.

One of the other things we like about GameFly is that you can choose to keep a game, and pay a reduced "used" price.  They also give you credits for signing up, and also ongoing credits as you remain a member - so these add  up!  We kept a $19.99 game that we rented, and paid just $8.49.  When you choose to buy a game you've rented, GameFly ships the box and booklet right out to you.

Renting games for the Wii, or any other platform for that matter, is a great solution to finding out which games really are the "keepers" and worth paying to own.