I've played Megaman Battle Network from 1 until the middle of 3.
The more i played the more i hated it.
Maybe because the rate of random encounter is too high...
If you have a Sony PSP, you should get Jeanne D'Arc. Got it yesterday and played it. I'm still actually playing it, but im gonna wait for battery to recharge. It's a good tactics game featuring histories Joan of Arc, but with twists that make it a great Japanese style game, even though it's happening in France. The game is made by Level 5(known for great games as Rogue Galaxy and Dragon Quest VIII). So I say it's a must buy for you if you like tactical RPG's and you have a PSP.