i am not strongly against these kinds of players like some folks are. but, note that your weak schedule is a big part of why he is doing so well, high per low spd/bh players typically are better against weak defenses, but struggle against quality teams. so in the competitive circles, i guy like that isn't going to get you much. however, those kinds of guys are great on developing teams, even d1 mid majors (obviously better ratings required, but similar idea).
even the guys with the speed as well, who are high profile scorers even in high d2, aren't as good as their 20ppg suggests, because the defensive half of the game, they are dragging you down. but to me, its not like its a 50/50 split - 50% great, 50% ****, averages to average. i think its better than that because on defense, this kind of dude is roughly 20% of the defense (while on the floor), but more like 40% of the offense. so i think you have a player who actually is 2/3rds a really high contributor and 1/3rd ****, which averages out to good, i guess. it just depends on the team, if you need the offense, these guys can be great. if you want to win a championship, and already have a good team on both sides of the court, these kind of guys are probably not going to cut it.