I know I'll catch hell for this and some people will question whether I'm being sincere or being a really great troll (something that I don't quite understand, because I'm not sure how my comments come off as insincere,) and this is not to offend or provoke anybody at all. Here goes.
The reason I was so pro-Walt was because I was completely invested in the character. I wanted to see him prevail because of his convictions to being the best and not letting anybody stand in the way of that. He did do a lot of terrible, unforgivable things, I agree. But he prevailed so many times when it looked like all hope was lost. His ability to do what he had to do to be the absolute best in the face of seemingly insurmountable odds was pretty awe inspiring. In the end, he paid the price for it all. All choices have consequences, and these were the consequences of the path he chose to be the best. I can't say that he didn't get what he deserved in the end, but I'll be damned if I'm not sitting up in bed thinking about the character I had invested so much dying. The end is bittersweet, because he ultimately won, but the cost was his very life, along with many other lives.
I also believe that nobody is beyond redemption, that's just my Mormon upbringing coming through. We are all capable of redeeming ourselves no matter what we've done, and I wanted Walt to redeem himself, which he did, but again, at the cost of his life. Maybe that's the point, though.