I've already put it here yesterday, but hey: last season Carr covered Odell beckham, AJ Green, Mike Evans and Golden Tate for most of a total of 5 games, and he allowed a total of 1 TD on these games - and even that wasn't really on him, but blown coverage of the safety. He covered OBJ in 6 games and never allowed a 100-yard game for him.
Sounds like good enough for me.
Also, you don't play 144 games in the NFL if you're "not a good player"...