I'll agree that interaction with the game world is a little fiddly sometimes. Clicking on a door to open it sometimes makes the game think you want to go outside and run around the building to other side of the door. Moving and manipulating objects should have used different mechanisms (l-click and r-click maybe) so that sort of thing couldn't happen.
It's worth complaining about, but not to the point that you think it should be a bargain bin title. There are too many great things about the game.
I think the game isn't widely played because it gives a bad first impression. First, the title is seriously weird. Second, the first part of the game is drab and seems like a poor Diablo clone. It's just blind luck that I didn't toss the game's butt off my system after an hour because, as an American, I have a tiny attention span, want immediate gratification, and don't read documentation to find out how trading works.
