Indeed, his throwing mechanics are poor. You and Korn were wrong when you claimed I invented that criticism. Not only can you read about his throwing mechanics by doing a simple Google search, you can also watch him throw and observe. That is, if you know anything about throwing mechanics. The fact that he has made it work for him over the course of his career doesn't mean it's not poor mechanics.
As for my critique of his hands, do you deny that he has misplayed a number of balls so far as a member of the Red Sox? Do you deny that several balls that he hasn't misplayed have been snow coned in his glove? And finally, do you deny that you would criticize other players if they handled the ball the way Beltre has to date?