Well yes and no, GOTY isn't a genre but it is hand picked out of a bunch of games mainly in specific genres. A good example is why wasn't FH4 nominated for GOTY? Not that I am saying it will win it, but neither a fighting game or racing game goes in the GOTY category for some odd reason, probably because they have there own awards at the show, but than that makes it that they choose from specific genres for the GOTY. So its a little weird.
I am sure other GOTY sites have there own nominees and probably include the other genres but for some reason this event doesn't.
You do realize that every game picked out for GOTY has their own "genre specific" awards right? Eg GOW was also nominated for "best action/adventure game".
There is no conspiracy to anything here.