Rush decks can be very powerful... they can also get shut down. I got 3 consecutive losses with my Fire rush deck. Of course, 27-3 to 27-6 still isn't that bad.
IMO The best deck is the deck that destroys challengers while still being original. Unfortunately, I have not been come up with such a deck. Seriously, though. Try a control or a stall deck? All you need is a fast setup, and then you're basically set, if your stall works well.