Marcus Carter

Does anyone who has seen this guy in practice think he will make it as a wide receiver? I look at him and think, WOW, this guy is everything you would want from a receiver. He is tall and fast. But then from everything I have been reading, he has been very mediocre, at best? What is the deal. I do not mean to rag or pick on any player, I am just curious as to what his difficulties might be?