I don't think Suzaku is really bad. All I see is that people get pissed off that he turned him in to get Geassraped by the Emperor, but that's pretty much all.
It isn't that Lelouch is evil, it's just that he's unneccessary. Everything would be fine in the long run if Euphie was still around with Suzaku and such, but even that wasn't entirely Lelouch's fault so much as losing control of his Geass. In a sense you could blame him for that, like a "he has the power of a devil" kind of thing. But then again, it's not like Suzaku would ever be able to be Emperor-tier.