From a physical standpoint, Johnson is a freak. Huge body with giant hands, and blazing speed. One thing that really stands out, for a player as young as Johnson, and as big as he is, is his agility and body control. He runs nice crisp routes, and plays very light on his feet, and when he has to, can jump through the roof, and get the ball out of the air. His size and speed make him an automatic mismatch for any defender, and the number of defensive holding and pass interference penalties he draws show that. Truly a rare talent at the position. Also great after the catch, with surprising speed.
NEGATIVES
Other than needing more experience, there's really nothing to haggle about Johnson's game. Being as big as he is, some will question if he can play wr in the NFL, and he does need to keep improving the little details of his game, like in his routes, especially short runs, and making sure to minimize the number of body catches be makes, but it's hard to be too critical of Johnson's potential, given he's only a junior.
FINAL WORD
Best wide out, in a great wide out draft class. The one thing to track on Johnson is, will Ga. Tech keep getting him the football. He's the best playmaker at any position in the country, and really has a chance to put himself on an elite level, among his peers.