
Egads, Rangergirl, you haven't tried a Castlevania game?!? I would suggest starting with Symphony of the Night (which is on a gob of different platforms at this point) or Dawn of Sorrow on the DS. Those are both of the Metroidvania style and are quite good Pretty much any Kirby game is good fun lol.
As for TriForce Heroes, do not wait to jump on that if you can get two other people in the same room with you to play it. The online stuff works very well (never had to wait more than a few seconds to get paired up) but you can't beat that couch co-op communication.