This is exactly my problem with it. He's one of my favorite characters and always has been, but now he's kind of ruined.
No he's not, it was all a giant yellow fear bird's fault
I will say that unlike a lot of people, I've really liked Scott the last few years. He may have behaved in some magneto-ish ways at times, but it's generally made pretty good sense considering the circumstances. Also, he hasn't left the team to go mope like 80s Cyclops would have (probably at least twice by now). Can't say I'm happy about this recent turn, as we're clearly headed for people being "disappointed in Cyclops" (most likely the time travel versions of Jean and his younger self) and I think that works better if you've made difficult morally grey decisions, not the go mad with cosmic power and kill your mentor ones.