Humanity being special has always been part of Mass Effect.
Maybe, but is humanity the most interesting part of Mass Effect? I don't think so. Humanity doesn't make Mass Effect unique, it's universe does. There are already so many science fiction stories that are focused on humans and the planet Earth, but how other science fiction franchises have the Asari, Krogen, Turian or other races that Mass Effect has? I would sooner ditch Earth in a heart beat and fight for them than taking back what so many other science fiction stories have done in the past.