Bingowings said:

One friend of mine refused to watch the VHS with me when it came out but would watch the first two which I thought was a bit pointless.

I have no trouble to understand the choice by your friend, ROTJ was IMO an insult and a joke to the audience who expected a real continuation and sequel to ESB. I don't find it pointless to only rewatch those films I do like even if that film have an open ending. I personally find it a bit pointless to repeatedly watch something you don't like only because it's a sequel to a film or a series of films you happen to like.