I don't see greatness in Tannehill's game up to this point in his carreer. Sometimes he seems a bit robotic with no feel for the game, but he'll stand up, forget about that bad play and start over. He's a good starting QB and could still get better, if he somehow finds the sights for the long game he can be very dangerous.
Right now, I see him as the same type of QB that Alex Smith is, he can beat you but you're not overly concerned with his game.