Duuude, you should get around to play it more often~! Xenosaga I is okay for the most part, I liked it, decent story and all. People disliked II for being sort of the lamest part of the series. I dunno if it's the change in the battle system(it most likely is) or anything, but most people didn't like II, I personally didn't mind it, but it did end sort of abruptly for the most part, and the boss battles are sort of extremely frustrating. Out of the whole entire series though, III was the most liked, just because it had the elements of I and some more, apparently.
Either way, I do encourage you to play the games when you get the chance. They're not...so much boring so long as you know where you're going with the story, and the boss battles and stuff are sort of interesting, at least to me. xD; I mean, it has a lot of philosophy and religion as far as story is concerned, but it's stuff that's...interesting, y'know(well I'll let you be the judge of that, this is how I think of it)?
I only disliked the series primarily because it's literally so flipping hard to grind in that game. I mean, I may possibly exaggerate, but I will admit it does take a while if you want to learn some new skills(and you would have to reach certain levels for it, and sometimes you have to grind for hours and days just to get to more useful ones. Then again, this is Xenosaga II and why I found it so frustrating because their system of how characters learn the moves and all is really...strange, to say the least. I like I's better).