Indeed, Xenosaga was crap. Xenosaga the ANIMATION? What a joke, more like the lack of any good animation. The lips weren't in sync with the dialogue, terrible animation, just god awful basterdization of the original story line and events of characters, and very little reason to watch this once you've beat the game.
I didn't quite like SR in the first few episodes because Tenma-chan had a SERIOUS case of ADD. No really. I just can't stand characters who's faces change every nano second that you can't even visualize in your mind what her normal face looks like. Harima Kenji was no better, what you'd call no brain, and fake brawn. Some episodes were hilarious, as when they visited the beach and Harima was "accused" of raping Erika. LOL.
Also, worst DAMNED ending ever. I mind as well spoil it now: basically the ending has a lot of "what if" scenarios, and in the end we have to assume Tenma confesses to the turtle boy, since the camera pans out and her confession is not audiable.
The 2 OVAs after that didn't help AT ALL. WTF.