I really didn't like Misa. Yes, she was an idiot and easily controlled so you can mostly blame it on Light, but that still doesn't excuse her actions. She wasn't completely manipulated... she was the one who sought out Light when she found out he was Kira in the first place. She was pretty much as bad as Light, just not as manipulative and she wouldn't have killed her own family. What really annoyed me is that in the end she was let free without any penalty whatsoever.