Oh, you meant that... I AGREE, man. He's doing fantastic job in serve, because he's so tall - just like Ivo Karlovic for example, who did one of the fastest services EVER(like not the fastest), and of course it's easier to make an ace on the line or in the angle of court. But his game based just on that, or maybe on some forehands which he's doing two, three times in a row in the same place and it's predictable. After some hours of match his service is also easy to predict, in the last game of match Mathieu made some nice returns, Isner fucked one backhand(as you said, it's shitty), made an out by forehand, he couldn't do it on straight line but diagonally(he did it twice) and goodbay Isner.
Actually I meant that his game is boring for the spectators but he somehow wins his matches because of his serve. And I don't want players like him because they make tennis boring, killing the sport in this way