I wouldnt rank him too high up but he's definately worth a lot more to you than a 1ball skill 5 ball potential guy. 2 balls would still = starter or whatever and you could train at least to profiecient and have a quality player on your team.
the 1ball player no matter what the potential, would never have the skills to play in any team without serious training, and it wouldnt be worth it.
Just my opinion though. My 5 star 2 ball guy is just above my 3 star players.