He's physically elite.
6'3"
220lb+
4.42 40
81" wing
33.5" arms
43.5" vertical
11ft 8" broad
6.77 3 cone
But played in one of the worst passing offenses in the league
He's a project but massive upside and a huge depth upgrade
His stats are very similar to Andy Isabella's and frankly I think that Isabella is better.
Boykin has 33 catches on 56 targets for 470 yards & 7 TDs. Catch percentage is 58.9%
Isabella has 31 catches on 49 targets for 426 yards & 3 TDs. Catch percentage is 63.3%
Boykin technically has been more productive.
However, Boykin has started 24 games for the Ravens while Isabella has only started 3 games for the Cardinals. Run based offense or not those stats are awful. He looks like an NFL player but he doesn't play like one. Ravens fans consensus on him is that he can never get open and that when he does get open, he drops the ball. Signing him would be just as exciting to me as signing N'Keal Harry. Less so actually, Harry has shown to be better than Boykin.
You're not the only one who thinks Boykin could be good elsewhere. Its a common opinion. I guess he'll be cheap and there is always hope that somehow he turns on the lights. But I think there's a better chance of Isabella turning a corner than Boykin.