Duong you sound like you almost wish Fed was less successful and popular so you could respect and love him in peace. It's nice that you like him so much, I like his game too, and what he gave to the game, not so much his personality.
yes you're right : "less successful" (if he "had been" more succesful rather than if he was more precisely) would be great to feel more in peace.
As for his personality, I think he's far from perfect but he's nothing like what many people say, he's a down-to-earth person, and quite simple, he enjoys the way he plays and that he wins, but why wouldn't he be allowed to enjoy ?
And nothing imposed him to play Davis cup, and in what he says you can guess clearly that he doesn't have big hopes to win it, he doesn't play it for his resume but because he enjoys being with the team, and because now his other goals are less numerous and give him more time (in the past, MS1000 tournaments were important, now not so much).
I think that's also a part of the problem of the Swiss media about it : the fact that he said he will play tie by tie, that he didn't look devastated by the defeat (for a long time now he's been able to forget defeats quite quickly), they would like him to say that's a big goal for him whereas he rather plays to be with his friends. Hence also the opinions that he didn't make his best, which I think is wrong because of the fist-pumping to save break points against Isner ... and anyway Federer easily gives this impression that he didn't play his best because people overrate "his best" so much.
Wawrinka wrote about his relationship with him last week : it sounded like a sane relationship, nothing like what some Swiss media wanted make look like because they needed an explanation for the loss.