Hammer had influence alright. His influence was a dark warning and a cautionary tale of how shallow, vapid, and flat-out terrible hip-hop could potentially be, and he along with Vanilla Ice defined the word "selllout."
Hammer to this day is synonymous with wackness. When hip-hop heads think of Hammer, they don't think of classic records or a skilled emcee. They think of garbage pop music, selling out and genie pants.
You're not going to fare well in any argument by trying to throw some armor-all on the steaming pile of shyt that is Hammer's hip-hop legacy.