I love the heat he gets it reminds me of when Corbin started getting heat in NXT once the squash match gimmick passed. Corbin was taught to embrace the heat which really developed his character and I love him and love that he's doing something on the main roster. Samson could basically be Raw's version of Corbin if they book this right.
What i hope they do is keep him out of the ring for a while just yet, appearing backstage, maybe get him to face off with a low-midcarder and have him squash him in his first match and have him sing to his opponent with the lights down after he beats him Then book him in a few squash matches and singing after that match to draw heat from the crowd. Use that heat, then book him in a program with a big face (i.e. Balor - where he will draw even more heat from the crowd). He could possibly be a good solid heel. As for top superstar i'm not so sure (unless he moved to Smackdown as there's no chance he'd get near the universal level)