Thing is, does Summers really have any particular likeable qualities? When he's not being a whiny, mopey emoboy, he's pompous, self-righteous, has no sense of humor, he's prone to fits of rage(and I'd be more scared of his than Logan's--he has better range), and apart from flying, I'm trying to think of his interests besides mutanthood and Jean. And then of course there was his little psychic affair with Emma, which not only did I find totally in character(especially in the passive-aggressive way he slid into it, so to speak), but in a way made him a little more likeable in that he did something human. Again, so to speak. He has the emotional maturity of a 15-year-old.
Add all this to the fact he can kill you by blinking. Oh yeah, this is a guy who'd be the life of any party. Truth be told, he never deserved Jean OR Madelyne. I also thought the way Marvel readjusted Madelyne to remove his guilt on this matter--that she was never human at all--was a little twisted. Much like they couldn't allow Jean being the first Marvel superhero to really take responsibility for havoc she'd caused to stand.