Oh yeah!
I mean, all Decepticons were surely created evil on purpose by whoever built them and Megatron was in a tight spot, constantly clinging onto his leadership whilst fending off the Machiavellian Starscream and trying to crush the rather bland Autobots. It was a tough job! Were his actions "for the greater good"?
He's similar in some ways to Edward the Confessor, the ambitious Starscream being his Harold Godwinson.
No, I think there was one point where he showed an 'ok' side. Forgotten what exactly.. or am I thinking of Darth Vader... hm. Got all the cartoons at home, must watch them again.