Xenosaga is basically a remake/reboot/reimagining of what the creator intended Xenogears to be. It was supposed to be 6 games, but Namco decided to cut it since they weren't making much profit out of it. First game is decent, but the character models are mostly bad. The 2nd game has somewhat tedious combat and acts more of a set up. 3rd game has the best of everything, and the best turned based mecha combat in any game I've seen. But it does rush towards the ending and has some cencorship problems that really hinder the story. Despite some of the flaws, I still think it's a worthwhile trilogy to play as the setting is really unique for sci fi.I never played Xenosaga. I heard it was supposed to be an attempt to act as a prequel to Xenogears but they didn't have the rights do make it an actual prequel and then each game had it's own notable issues up until the point only 3 of the presumed 4 ended up getting made(Because Xenogears was apparently Ep5 of 6 according to the Japanese universe/game guide Perfect Works).
I take it there are some redeeming characteristics to the Xenosaga games despite all of that.