Right now, it's the new comic book adaptation--the kind that got made in the 1990's.
When success will come depenRAB on when the studios figure out what comic book movies did a few years ago--you adapt the comic into a good movie. You do not make a movie that comes off like a glorified comic book. There is a difference. And that difference is why Spider-Man succeeded, and why the reboot of the Batman film franchise succeeded, and why Iron Man was both successful and a bloody lot of fun.
Speed Racer, clearly, was distinguished by a special effects onslaught that nonetheless did not capture the audience's imagination--yes, other factors matter. DB Evolution, meanwhile, went for a loose adaptation that nobody, it seems, is entirely satisfied with. Purists are not happy, action fans are not happy, and your typical moviegoer is not interested because they foolishly limited the demographic appeal by making Goku a teenager in high school.
Simply put, not everybody in Hollywood gets this, and that's why a lot of these projects fail (edit note: I'm referring to the various C-list comic book adaptations as well). Eventually, one would hope that other would-be movie projects would learn from earlier mistakes and at least put out something that's generally acceptable. I just don't know when that will happen.