As I recall from numerous review sites a year or so ago, most of, if not all of the Japanese audiences hated it hated it, in fact, even the people who created Big O (season 1) had no intention of doing a season 2, and didn't want to make a season 2, but NA companies, or branches of companies managed to convince them to make a second season anyway. Again, from what I remember, season 2 bombed in Japan....What I still haven't heard much of, except in this topic, is what did everyone else think? I've only seen about 3 or 4 full episodes of season 2, so far
Slight spoilers ahead....though probably everyone's already seen it
I like it, I liked the flashback first episode of season 2 and seeing how different the world was, and everything getting lumped in which in someways made it cheesy to feel the need to throw ALL the loose ends in like Beck, Dorothy, and Dan Datsun and the girl from Winter Night Phantom when they were young....or so we're led to believe, but I've still liked it so far.