I’ve read that WarioWare: Twisted! (the only one I haven’t played) is the best in the series, so you can check that out instead of the original one.
If you missed them the first time around, you should play Yoshi’s Island and Legend of Zelda: A Link To The Past (with a bonus game, 4 swords, on it!).
Drill Dozer and Pokemon are pretty good, too. :)