No disrespect meant, but I think the better player still gets there more often than not. Sure the underdog has a chance to win, but it isn't nearly as brutal for the better player as a short tourny race to 7 or 9.
The better player will get there "more often than not" whether it's a race to 100, race to 25 two out of three sets, race to 11, race to 7, or a race to 1. It's just that the shorter the race, the greater the chance of an upset.
I think the race to 25 two out of three format is fine (I would even be fine with a race to 21, two out of three format).