I thought Gilbert looked better than Rush overall, but I won't second-guess the decision (much). It stuck me as odd how little the starting QBs played in the last two preseason games. Seems like a weird way to run an audition.
A better 2nd string QB would be better, of course, but it is tough to know ahead of time exactly who would be better. There was some reason to believe that Weeden and, later, Cassel could/would be decent backups, but they weren't. I'm not convinced that Rush/Gilbert are as bad as Weeden/Cassel. It'd be great to have another Jon Kitna, though.