Mobil Suit Gundam Zeonic Front. Very challenging, since you fight superior gundams, you have to be smart and quick and flank and stuff to kill them. You own 3 teams each with three zakus at max(not totally sure) or so and you plot their course on a map, and you play one of them. My favorite level is when you play as Char in his red Zaku and you have to sneak up on one of the best gundams by hiding around the building in the city. When the time is right you use his powerful axe to destroy the gundam. I never passed the last mission. I tried to play it a couple of years ago and I played worse then when I was a teen.
Jade Empire, made by Blizzard. Good story, good graphics for the time, fun mechanic in fighting that combines strategy with quickness. I beat the game several times but I could not get the girl to fall in love with me. Two girls actually, both very different in spirit. You can kill all the people that started in your quest at the beginning and middle, at the last second in the end. Open palm is the good side, I believe if I can remember Closed Fist is better at the begging and middle, but Open Palm comes at the end to be stronger. It's a game about good and evil and I think it's better than Fable. Well I got to go so I'll leave it at that for now.