If Eyes Of Laura Mars had been miss-attributed to Dario Argento (and the necessary unnecessary gore added) I think it would be a major cult hit rather than a minor one.

If Robocop 2 had not been written as practically a remake it would be as well regarded as the first one. Never Say Never Again (an actual remake) was more of an exploited legal loop hole than a film.

Empire came too late to make Kirsh's name as a major director and limited his options. Though ESB is more Lucas than he often gets credit. Kirsh's desire to get it right regardless of the show going over it's projected budget is probably the reason Lucas distanced himself from the films near perfection and embraced the 'it'll do' attitude of ROTJ and the PT.