Heh. I'm only a fan of the Ultimates, and then only the first two series. (The third took a nosedive like you wouldn't believe.) And that's partly
because they lacked a lot--not all, but a lot--of the goofiness that pervades comic books in general.
For instance, the Ultimates version of Captain America is an actual soldier, not a boy scout. He's still a good guy overall, he's still got the whole "All America" thing going, and he's still got the old-fashioned sense of right and wrong. But he's a much more ruthless combatant, and a lot quicker to solve problems with fists than words--basically, exactly what you'd expect from a so-called Super Soldier.
My favorite Ultimates version is Thor, though. As described above, most people assume he's just a crazy guy with super powers and his heart in the right place, who
thinks he's the god of thunder. He's also a rabid environmentalist to the point of almost being hippy-esque, and politically active. Which doesn't mean he won't cave in your skull and call down the lightning on your twitching corpse if need be.

I actually hope they not only take that approach in the Thor movie, but leave the question at least vaguely hazy.
I dunno. Overall, I just thought the Ultimates really presented the characters in a more real-world paradigm than their original versions. (Note I said "
more real world," not just "real world." There's still plenty of comic bookiness.)