One of my biggest soapbox topics that gets me riled up in the world of classic comics is the conception that Jason Todd can easily be summarized and thus written off as that second Robin that no one really liked.
In fact, Jason was written with six entirely different characterizations at various points throughout his 6 year stint as Robin.
Here's my brief run-down of the various incarnations of Jason Todd. I really don't think someone can judge "Jason Todd" without first understanding this:
All You Need to Know About Jason Todd (Pre-Death)