People can't think outside the box, I guess. The exact same could be said of Bale.
Chelsea couldn't dominate teams (even the Champions league win was them defending and being dominated)
Save for the Champions league, where they essentially defended for their lives, they rarely showed any tactical sense. They played a completely different style of football, lacked balance, and gave him complete and utter freedom within this loose system.
The Champions league that every one harps on about saw Mata go from Chelsea's most influential player down to Chelsea's fifth or sixth most influential player. He was was one of the more dispensible players within that cup run. About all he truly offered was set pieces, when it came to crunch time. Reading all these references to that flukey cup win, anyone would think he actually led Chelsea to winning the Champions league.
He didn't win Premier league player of the year, he won Chelsea's player of the year. And Chelsea were crap in the league those years, but as has often been the case with Chelsea, they knew how to grind out a cup run.
Somehow Mata still didn't find himself above Silva or Cazorla in the Spanish team, despite apparently being so good.
That backs up my idea that he's not great when the team are actually dominant. He's only great when the team is less dominant and give him freedom. Freedom that usually doesnt get given in the best teams. And Chelsea's Champions league fluke didnt/doesn't make them one of the best teams.