I'm going to stick my jaw out. Way out.
I mostly don't like the superhero humor books I see praised quite a lot out there. People complain comics aren't enough 'fun' relatively frequently, but think there's a thin line between 'fun' and 'silly' and an even thinner line between 'silly' and 'stupid' and most comic book writers just aren't good enough not to cross it. Even great writers can't always do it consistently, and most comic book writers aren't great.
I don't like some books whose praises people regularly sing, most notably She-Hulk and Nextwave. The former struck me as a not-particularly-original rehash of John Byrne's run on same (with a less talented writer and a really bad artist) and I didn't keep buying it, though I might be the only person out there who desperately wants to see and buy a seriously toned She-Hulk series that isn't a dumb humor book. The latter made me ask, not for the first time, whether Warren Ellis wouldn't be happier writing about something he likes when he obviously hates superheroes so much. Simply put, I stopped reading both books quickly and the latter being cancelled doesn't particularly bother me.
I think the best mainstream superhero comics are those that play it straight and that the most effective way to deal with the inherent silliness of many comic book staples is to make the effort to treat them as if they are not at all silly in their world. I find that humor books in the superhero genre all too often wallow in silliness and thereby avoid the need to have little things like plot or characterization.
This isn't to say that good superhero books can't be funny. But I like to read about characters I like, written by creators who like them too. All too often, the writers of 'funny' superhero titles seem like they really /don't/ like the characters abd are venting their personal hatred in the form of mean-spirited jokes at the character's expense. All too often, the characters in humor books are given radically different characterizations than they receive in serious books and this jars unpleasantly. Humor books are too often mean-spirited and characters are too often made stupid for the purposes of the jokes.
Humor can work very nicely in the context of a story. But all too often, satire becomes the substitute for plot and characterization becomes a set of broad gags. I think there are two questions writers should ask themselves before writing 'funny' superhero comics. First, would the story I want to write be better served by creating entirely new characters outside of continuity for the purposes of parody/satire? If you want to write pure satire or parody, then the best way to do that is to use characters created specifically to parody others rather than using the originals to parody themselves. Second, if that's not the case, would the story I want to write work whether it was intended to be humorous or not? A good story is a good story, independent of its humor content. If your story is completely dependent on its gag conventions, it's better to work at writing something that isn't.
I wasn't impressed by Nextwave and I'm not crying over it. I'd like to see She-Hulk cancelled as well. While, ideally, I'd love to see a serious She-Hulk book I don't believe this will happen because there likely isn't enough of a demand for it. It also risks being too much like Daredevil, revolving around a Super-Lawyer, though I personally think that there are significantly different angles that could be played in a She-Hulk book indepedent of stupid 4th Wall gags. That said, I do think a good writer could achieve quite a beneficial result by having Jennifer team up with Marvel's other lawyer-in-tights. Daredevil has had one sidekick vastly more powerful than himself in the past already, in Luke Cage. Giving a female partner who is his equal as a lawyer and much more powerful than him physically could be interesting, and I can see ways to make the power differentials work. Either of these solutions would be better than what is, essentially, a mildly funny title that wouldn't be worth reading if it weren't funny and isn't funny enough to be worth reading every month.
Well, my jaw's pretty well hanging out there now.