I don't think it's fair to label everyone who thinks Starcraft is the 'best' and has 'faith' in Blizzard as a 'fanatic'. I do think that Starcraft is the 'best', in the sense that I've had more fun playing it than any other game; and as as for Blizzard, I rate them above Relic since they haven't released a game that hasn't been fantastic during the time I've been following them.
That said, if I don't enjoy Starcraft 2 or Diablo 3, I won't force myself to continue playing them, and I might think twice about buying the next Blizzard game. I also wouldn't miss Supreme Commander 2 if it wasn't made.
Off course i did not want to imply that everyone supporting Blizzard is blind fanatic, if it was the case and you feel offended, i apologize.
Anyway, i still think that Starcraft is by lot of people considered to be better game that it actually is.