But the Red Hulk's totally being turned into some kind of antihero. Or at least into someone who's got his own book.
And we're going to get more writers using him thanks to Fall of the Hulks/World War Hulks.
And dear God, someone needs to put down Frost
already, and Rulk would have more fun doing it than Ares would, as awesome as he may be.
I'm not opposed to a villain protagonist, just that if the appeal of Rulk is that he's a big mean jerk who hits people in entertaining ways, then there are many other characters who can do that while having actual depth. The aforementioned Ares, Deadpool, Venom ( especially Mac ), Daken post-Dark Reign, and even Joe Fixit are all better Heroic Sociopaths for leading roles.
Rulk is the kind of character who would be great as a Memetic Badass, but not so much as a character you're expected to pay $4 a month to read about on an ongoing basis.