It's been a few years since I saw RahXephon (you're right it's X :)) but I would certainly agree on the series being a little inconsistent and uneven.
As for Texhnolyze, yes, it's definitely one of the more experimental and bold anime series. It's a little bit like watching a Lynch movie set in a dystopian, post-apocalyptic world. It's brooding and mysterious, full of ambiguous scenes and sparing in dialogues. And the soundtrack is just amazing! I thoroughly enjoy it so far, but it's not a series to watch in one go if you want to keep your sanity intact.
