We just finished watching Gundam Double O, and I quite liked it.
I preferred the first of the two seasons by large. I thought it discussed the usual Gundam-esque themes with an ingenuity not often found in the genre, proposing something and then actually countering it. It was also somewhat free of the now obligatory double-layered machineism (I mean, the usual "all vilains are not that bad, all good guys have a dark past" cliché).
It felt a bit unequal though, with the Alleluia/Sergeï story arc feeling by far the weakest of the whole.
It turned into something a bit worrying when a band of red clowns showed up as a spectacular deus ex machina, and sadly, that trend took a turn for the worst in the second series. As with Seed, it seemed to become a parody of itself. But the second series discussed quite bluntly the hypocrisy of Japan's so-called pacifism, and that almost redeemed it in my eyes.
I still didn't feel like it was a waste of time: I liked the writing (the guy is no Tomino, as a lot of lines were more-or-less not that intentionally funny, but it's got style, at least), and the first series was really good for a good part of it.
Next up is Code Geass I guess! Quite a bunch of those it seems, I hope we will watch them in the correct order! (I guess it's Lelouche's TV series first?)