I never thought he was that bad. Yeah, he botched, but not enough that it ever bothered me. Then again, I didn't even watch the majority of his matches in WWE anyway. If it wasn't on PPV, then I rarely ever saw him wrestle since most of the time, I skip most of the undercard matches that are shown on Raw or Smackdown.
Lack of communication seemed to have doomed his character from the start as the number of latino stars continues to dwindle.
Who's going to call spots with a guy who can't even speak english?
Rey was injured and Sin Cara was being pushed (Del Rio wouldn't be jobbing) which left only Ricardo Rodriguez (who wasn't wrestling talent at the pinnacle of Sin Cara's push) to do the job.
Once Mistico left, HHH (who had been his biggest supporter) turned his attention to his NXT call ups
It isn't too late at all. Getting people to care about his in-ring work is all it takes.