Just to give my two cents, Pique is definitely a target for some people but it's pretty well deserved on many occasions. Some qualities which make him look piss poor are:
1. How he approaches defending 1v1's- Every time you see him defending against an attacker that's dribbling at him, he's either retreating to the point where he gets beaten and has to chase him, or he falls on the floor. He's not doing what he should be doing, which is smothering the attacking player into making errors and actually putting pressure. Standing in front of the guy just for the sake of being there isn't defending if he isn't gonna stand his ground and get the ball.
2. Aerial ability and physicality- He's been gifted with height and long legs, yet happens to be one of the worst aerial defenders in elite football and slow as a boulder. You can see from his physique that he isn't even fit or muscular, which is a pretty obvious reason as to why he can't jump for shit or dominate attackers despite his colossal size. I'd bet that he wouldn't even be slow if he were to sprint-train with more dedication. Needless to say it's glaringly obvious that he is not even slightly fit or physically strong for a footballer, which can be attributed to lack of motivation.
3. Command- As a guy who spends more time in our starting lineup than almost any other player, Pique has yet to take on a leadership role at all. Guys like Mascherano and Puyol are imposing and inspiring, yet Pique just sits back and does his thing like it's nobody's business.
A lot of this can be solved by picking the guy up off his ass and making him work for his spot. It's not THAT often that a footballer declines due to an increase in responsibility, but that's what happened to Pique and he seriously needs to fix this. When Puyol returns, it should be him and Masch starting. When January comes and a CB hopefully arrives, Pique should be struggling to get himself on the starting lineup. Only then will he possibly improve to the level he should be at.