I still have yet to play Xenogears, but the Xenosaga series might be my favorite RPG series of all time. I've replayed the first game so many times. I even really like the second game, which a lot of people seem to hate. The only thing I don't like about the series is how vastly different the character models and voice actors can be from game to game. It didn't bother me back when the games were first coming out, but it was pretty jarring a year or two ago when I played all 3 games back to back.