When Denver beat us, I was really upset and just hated the Broncos. I wanted nothing more than a Panthers victory. Watching the game though, I had a hard time rooting for the Panthers. I was just sort of indifferent.
Manning is a likable guy. He's pretty humble, he's doesn't take himself too seriously (i.e. in lots of light-hearted commercials), and he's one of the most productive quarterbacks in NFL history. What he said to Belichick/Brady after AFCCG was great. Rivalries are great, but a rivalry doesn't preclude demonstrating good sportsmanship; this is why I don't feel guilty acknowledging Manning or respecting him.
There are a lot of people I hate in the league. (For example: Russell Wilson is faker than a pair of silicone tits, and his coach is an arrogant prick.) Manning is not one of them though. I think he's a class act, and I really am okay with him. Him winning it all was a great way to end his career.
I think Manning is the regular season GOAT, and I think that Brady is the postseason GOAT. (this generation's Marino and Montana) Manning's regular season crown is kind of hollow though, because in the end winning is all that matters. This is why I think Brady is indisputably above Manning all-time.