Warioware was perfectly designed for a handheld console; innovative, easy to pick up, quick to put down and didn't get you stuck in long sequences, in short it's perfect for times when you don't always have long to play and addictive enough for the times when you do.
Golden Sun I haven't played enough of yet to say; only 3 hrs in but it's looking pretty good so far. I don't play handheld RPG's often but when I'm in the mood to I keep coming back to it, so it must have something going for it there.
FF:TA: no. Pretty, but the gameplay's too repetitive, the party members are a nightmare to keep track of and the game's far too long (kept forgetting the plot)