The problem here is that you think it's a given that nadal and djokovic break the rules. But they don't. Otherwise they would be warned and fined, that's why the rules exist. All you people say are pressumptions based on your like/dislike of a player. The rules are there for the umpires and officials to impose them and if they don't it's their own fault. Rafa and Nole have received numerous warnings for the time they take to serve but I don't believe that's deliberate or gamesmanship, it's completely unconscious from their part, they can't help it, and I don't see why that is breaking the rules.
And medical time outs? they're there for a reason, they're completely legal. Retirements? same thing. So on what base do you accuse them of gamesmanship? It's all bollocks.
Again I disagree completely. Nadal and Djokovic both know how long they're allowed between points and between serves. They continue to take way longer than allowed. Nadal is more guilty (guiltier? Brain fried after watching Roger's masterclass) of this than Djokovic is. I distinctly remember BOTH of them getting a time violation warning at the US Open final this year. Isn't this proof enough? Just because they don't get fined doesn't mean that they hadn't broken the rules. And it's breaking the rules simply because they KNOW what the rules are and yet they don't do anything to change their "unconscious" habits. Even if it's not deliberate, the rules are the rules. Nobody should get a free pass just because it's a habit. In this sense, though, I agree with you that it's on the umpires to enforce the rules. It's honestly quite stupid that they don't, although on the WTA side, Ivanovic was defaulted an entire game this year for taking too long during a bathroom break. THIS is what should happen, not the current situation when many people (fans here and commentators and journalists alike) think that Player X is taking too long on purpose and nothing's been done about it. Maybe the rules are enforced for the lower ranked players or at the Challenger. If that's so, it's still bullshit that the top players continue to get away with it.
MTOs are legit until a player starts to use them to disrupt his opponent's rhythm. Nadal's guilty of this. Djokovic, not so much, at least not in recent times. Nadal's MTO against Petzschner in Wimbledon last year was suspicious to say the least. And tongues only start wagging when a player pulls something suspicious too often.
I have no issues with retirements per se; it can't be gamesmanship if the match ends right there and then and the retiring player's opponent wins. But sometimes I prefer players to take a beating like a man. Case in point: Roger sticking it out in his RR match against Murray at the Masters Cup in Shanghai 2008. But then, this is just a personal thing and I don't think it really has a huge bearing on a player's sportsmanship; I get the sense that it was just Roger sticking to his principles and I admire him for that.
And sometimes, when a player retires too often, you just can't help but wonder if the reasons behind it are legit. Djokovic used to be guilty of this, but thankfully he's been much better this year.