You know who can be a really great character when written well? Cyclops.
He is conflicted, interesting, a fun fellow. Grant Morrison did a great job with him during his run on "New X-Men" and Joss Whedon did some interesting things too in Astonishing X-Men. Yeah, When he is done well he is pretty cool. You know where Scott Summers sucks though? The X-men movies. They over-play the worst attirbutes of the whole "boy-scout" angle, barely using him in the second movie and killing him off right away in the third. It's a crying shame. He seemed to be redeemed a bit in the Wolverine movie as a young child, but yeesh, is he lame in the flicks. Yeah, when given a good writer he a snazzy guy to read in the comics. Plus, as has been hinted, he keeps a lot of that power held back in his eyes, on the rare occasion he lets loose with it...wow. Yeah, I like ya Scott Summers, you get some props from me.