Honestly, most of the reports I've seen, including the national media's take on the scrimmage, have been very positive about JP.
While I normally tend to distrust anything coming out of ESPN's mouth, knowing they definitely arent Bills homers and still called Losman's debut "strong" makes me believe that at least in the eyes of other observers, he did very well for a player of his age and experience level. He will build on this scrimmage, gain more experience in the meaningless preseason games, and I think be ready to roll against Houston.
The good thing is that with our running game and our Defense...all we need is for JP to be average. Tampa Bay and Baltimore proved that.