For me it is Level E only right now. I have to check out Wandering Boy, Madoka and Fractale still.
Beelzebub seems like straight gag show; if I really wanted that, I'd start Gintama already. The zombie show is funny but it might fall into the Hayate no Gotoku area where it wears thin after a few episodes. No chance of Freezing aka an example of why I took a break from modern anime, and less of Infinite Stratos since I too stopped after a few miinutes.
Oh, and I'm still watching Bakuman. I'll probably drop it since an anime version is a bit pointless and I'm caught up with the manga.
I haven't read the Level E manga but I wonder if it does become a battle manga like the OP suggests. It didn't last very long so it could end up just being a hilarious comedy show with an interesting sci-fi premise.
and talking about manga, I read the first volume of
Shingeki no Kyojin. Only the first volume is translated so far, but so far it has been great. It's like Evangelion plus SotC plus a shounen battle manga that takes conventions and plays them against you. In the end if the first volume you see
spoiler (click to show/hide)
all these people savagely eaten by the titans. The main character rushes in to stop one, but another pops up and bites off his leg. He gets up once more to save his friend from inside one's mouth and you think it's going to be a big moment...until the titan bites down and you see his detached arm flying out of the titan's teeth.