I really find it hard to think of Pain as being evil.
Seriously, his more like a mentally unbalanced guy with super powers, or a super powered 6 year old with an unrealistic childlike view of the world. What's more he is Madara's (bitch) dupe.
The truth is that for all his power, Pain is still a fool, he's totally wacko, and Madara's playing him like a Violin. In the end Pain is like a Rabid dog that seriously needs to be put down so that the show (Manga) might go on.