Apple’s App Store vs. ???

This past week I read about Amazon’s entry into the application download space for the Mac.  The question that rang through my head is whether they can do it right.  From what I read there were already things that it can’t do and in some instances you have to download and install the application itself.  While I can do that I find myself bothered by it.  I don’t want to have multiple places to manage what I purchase online.  As it sits right now I hate having to launch Steam and work with some apps there.  In the end, I want one place to go and for it to take care of it all.  This is what I like about Apple and it’s what I expect.  I want the same experience that  have on my iPad and iPhone.