Its all to your taste. i personally enjoy watching Nadal. The man is a testament to controlled aggression something i've been trying to work into my game for a while now. You say hit it to the backhand while omitting the fact that the shot he's hitting to the backhand is a MONSTER forehand that picks up speed after it bounces. You fail to mention also that its an aggressive tactic. It isn't a push by any means, it creating an opening instead of wildly trying to create one, like players such as Tsonga and Gonzales do. Both styles have there merits and draw backs
Tennis is in essentials a percentage game, and Nadal plays percentages. It's a vastly underrated, and sometimes looked down upon, weapon. Murray knows how to utilize it, as does Federer. So i will sit and watch Nadal and enjoy it, enjoy the smarts, power, percentages, and yes, amazing defensive saves.