I see this with movies, certainly. Coraline, for example, was a visually stunning film with a pretty basic plot and characterization. Worth seeing for the visuals, after that, shrug.
Books too, actually. Nobody read the DaVinci Code for it's incredible characters and powerful portrayals of good and evil. They read it because the plot ran at 500mph and it was kind of fun.
Videogames will be trickier than either of those two mediums because like movies the player is being shown something, and like books the player is active in the process, (in a book imagining the story, locations and characters, voices, etc. in a game actively triggering events and solving problems) but like both of those mediums videogames are a thing unto themselves.
So yeah I think those niche review sites will have a strong following too because they will want to talk about things particular to their genre or area that are done well, and care less that other parts of the game don't quite work.