I think DC fans are just jittery. Not about a showdown of Batman vs the Avengers.... just life after Nolans Bat...... I don't blame them a ton of money was thrown at GL and it pretty much bombed out while THor and Cap both got alot more in the way of Box office and critical success.
I agree with the sentiment while both movies are comic book Movies Batman is almost like film noir at this point with some SERIOUS stuff going on. I loved Ledgers joker and I so look forward to this Bane... I mean the teaser really nailed it.... that shot of Batman raising fists over Banes SHoulder was CLASSIC.... I really kinda wanted to see a bit more of that in this most recent trailer.
Avengers certainly will not be comedy but it lends itself to a lighter world of cinema, realistic, but fun, filled with roller coaster like moments.
Face it both movies will have so much more going for them then say Transformers Revenge of the Fallen of the last Pirates movie.
I do feel though that some DC fans almost don't want to give Marvel credit for going out on this huge limb..... I mean the concept is dreamy, but it is also pretty bold to actually do it.
As a fan of Comic books and comic book movies in general, I hope the next Superman movie is an action filled blast that rides a tone simmilar to what I expect from the Avengers
Cheers...................