It sort of came to my attention more recently, I guess. I'm in a sci-fi club here in town, but we mostly talk about Trek. In our discussions of the films, it seems that while everyone agrees the stronger of the films are the even-numbered ones, VI always seems to rank on the lower end. A lot of my friends there feel it's a weaker film when compared to the rest. And even when I discuss Trek films with other people, VI NEVER seems to come up as a favorite of anyone's or is ever really highly-regarded.
Maybe it's just me. I like the film just fine.