No!! Haha, dual 7990s or 690s would destroy the Titans in any sort of gameplay, in terms of raw power. However, at this price range, you won't really see any difference unless you've decided to run nine HD/XD monitors, as a single good 780 will be perfect for anything 1080p-1440p.
And yes, you are probably correct about the faulty quad-SLI drivers (especially from AMD). However, it can't hurt to dream (both about the system, and about AMD having effective drivers).