He's shown he has excellent technique with some brilliant first touches and goals over the years but I feel his passing is very overrated. He opts for the easy pass the majority of the time and when he does go for the killer pass or a long range one it is 50/50 on how well it's weighted. Most of the time, I feel he's either underhit or overhit the pass leaving the attacker with more to do than he should have in terms of keeping it under control.
It was particularly evident in a game last season at home (I can't remember which) where we were losing and Mata decided to try and dictate the game from deep and just completely failed. If he wasn't passing the ball sideways he was giving it away with poor passes. Maybe it was due to not having runners off the ball as our movement under van Gaal was non-existent at times, but that didn't excuse some of the awful passes he made, and the fact he didn't create anything.
I mean, di Maria was on another level in terms of wastefulness but at least he created a decent to good goalscoring chance a game; something I've rarely seen from Mata at his time here. The one time I've felt he's done a decent job at that was against Southampton at home in a 1-0 loss ironically. It was like the complete opposite of the Mata of norm in that he had a real grip on the game and was dictating it, but was incredibly wasteful infront of goal missing 3 good opportunities. Away to Wolfsburg he was pretty good, too, but was bizarrely subbed off for Powell.
He's just not good enough to be a primary playmaker for a top team in my opinion. Though, I'd still like to see us keep him for another season at least.