I'm a little behind in gintama, but your post makes me want to watch them. Especially now that we are in the non scanlated part, I enjoy watching them even more. And yes Gintama opening are always great, the other day I watched the episode of One Piece post time-skip and I wonder myself. Why can't they ask Gintama anime staff advice to make something good !
Are you up to date with gintama? I like the new opening and the new episode about the funeral got me laughing so hard.
The so far so good(or even better) series this season are Mirai Nikki and Guilty Crown.
and also p4a. I'm not sure about the rest tho but Phi brain has been rather cliche and not as great.
Un-Go is good too but people say that it is rushed but who's to blame? There's only 11 episode for bones to squeeze.