Tigerstar, Evil or Kind?

I know what you are thinking, Tigerstar=evil. Ever since I read the first Tigerstar and Sasha though, I have begun to wonder weather or not Tigerstar is truly evil of his own accord. Sasha meets Tigerstar, and she sees something in him. She likes him alot. Then, Tigerstar starts to like her. They meet nearly every night. (Tigerstar at that point was the leader of shadowclan) They have a fight when TS finds out Sasha was a kittypet, but they get over that.

Tigerstar then asks Sasha to come and jon Shadowclan. (after he has taken her to camp and they have spent many nights together) Sasha said she would tell him the next day what her decision was. She snuck to the camp and heard Tigerstar talking about the battle with Bloodclan, and how he wants to make an army. She then realizes he has a dark side, and she leaves right away. Did Tigerstar want her to just become part of his army the whole time he had known her? Or had he actually cared for her?
In the series it also says that he mated with Goldenflower. Who knows what he was like then? I wonder how he got to be so evil and power-thirsty. I know, I have done a post about Tigerstar, only it seems there is a mistery around him. A mystery that may never become uncovered because he died.