It is something I cross over a lot with many gaming reviews. people complaining about how they wished a feature used in some other game would be great to have in the game they are talking about. The problem with this is that many times those features don't make or break a game, are just things they wished the game in question had or that they believe should be implemented. Many will go as far as give a game a low score because of features that wasn't there neither was promised.
I think this kind of behavior kinda dumb. A game, or movie or any product, must be evaluated by what it was promised to give and how much of this promise they accomplish. Not about things they never promised but the buyer wish they had. Or else we will ended up always disappointed.