No argument on the treatment of Cujo, he definitely got a raw deal. Much worse then Howard.
What did Howard "bring on to himself"? Howard is an average starting goaltender, who is paid like an average starting goaltender. According to sportstrac, he is the 17th highest paid goalie in the league. http://www.spotrac.com/nhl/contracts/goaltender/
Sure he lost him job to Mrazek, but that is because Mrazek is the future and Howard has had injury issues. Howard still has the skill set to be a decent starter in this league. When healthy, he has shown that.
If Howard was the highest paid goalie in the league, or even top 10 I would get the extreme negativity towards him. However, in reality he has played exactly to his level of skill....average. I am not sure why fans expected him to become Lundqvist or Quick, he is not that. He has played over the last 7 years here in Detroit just like he is paid, an average/slightly above average starting goalie.
When I say Howard gets a raw deal, what I mean is that fans expect more out of him then he is paid, or able to provide. It would be like getting upset with Nyquist for not get 90 points. He is simply not a 90 point player, nor is he paid like a 90 point player.