Not bad. You can catch his senior clips here from hudl. What first jumps out at you is his size. He's a big man running around out there (listed anywhere from 6'2-6'4, and I'd lean closer to 6'4). But he also moves pretty well, and does an excellent job getting behind opposing defenses.
And these aren't scrub defenses. This is south Florida, Miami area competition, and those guys have been known to take their high school football very serious. He's playing against lots of speed, and in an offense that is well versed in the spread and throwing the football. And it's that fact that makes me think Johnson could easily play right away this coming fall.
His size makes him a factor around the red zone and going long, as does his speed. He's a good route runner and can read opposing coverages well from the looks of it. He's got good hands, and is very difficult to bring down in the open field (that's size thing again vs. smaller DBs). And at the end of his hudl clips, you see him more than willing to peel back for blocks after a play breaks down. As we've all seen with Mark Richt, being a playmaker helps you see the field, but blocking well helps you see a lot more of it. And if Johnson already has blocking down, that should only accelerate his ability to see action.
Our WR depth chart isn't in dire need, but the opportunity to provide depth will be there for Johnson, Johnson, and Williams. And this Johnson brings something the other two just can't match with his sheer size. Combine that with a roster that looks very conducive to running a lot of 3 and 4 WR looks, and we can expect a deep rotation with likely 2 of the 3 freshman, if not all 3, seeing the field come fall. Plus with that size, speed, and a willingness to hit somebody, our south Florida product should at least be able to contribute on coverage units for special teams.