On that note, there's an oft-repeated bit of inherited wisdom in the RPG community that systems narrowly focused on x genre are better at genre emulation than "universal" or "setting agnostic" games. But as always, inherited wisdom should always be questioned. And frankly, I don't buy this one. My experience says this is not always the case. It is possibly even rare that it's the case.
A dedicated and narrowly focused game can easily have incongruous rules for the genre, number one.
Number two, is a game that has 10 pages of content about running the game really automatically better at genre emulation than a "universal" system with a 100+ page supplement packed with solid rules and advice and mods about how to use the core resolution system for the genre at hand? In my experience, the answer is a resounding no. Not only have they given you more than adequate framework and advice, they are often better at handling the fringe cases than a game with a very narrow focus.
I know I'm about to be asked for an example, so I'll give one. I don't have to look any further than my Gamma World game I'm running with QuestWorlds.