And then finally claiming that Lucifer isn't a villain? No. Sorry. With everything that Lucifer did to Sam alone, which isn't even in dispute by anyone in universe, Lucifer is a villain.

I didn't take this to mean Lucifer isn't CURRENTLY a villain. I interpreted it to mean the Lucifer who fell from Heaven wasn't a villain; that he wasn't an evil character who had to be locked up. And of course some have suggested that the Mark twisted him the same way it twisted Dean, and turned him into what he is now, which is definitely a villain. It will be interesting to see if this is the case, and if God regrets what he did to Lucifer (and therefore to those affected by Lucifer).

(Standard disclaimer... I could be wrong; I often am)