Preseason games mean plenty for a rookie in my opinion. I only wish this team felt the same way. I'm seeing a pattern of nobody playing in the preseason and then a team that's rusty starting the season. Other teams aren't afraid to get players work in preseason games, this team shouldn't be either. Injuries happen. That doesn't mean you should keep everyone in mothballs for fear of them.
If you haven't, take a look at the actual game footage. I watched it last night and came away impressed with him. The game doesn't look too big for him, and other than a boneheaded red zone pick, I thought he looked very good while the team around him looked like trash.
I can separate his performance from the jersey he's wearing where it appears that some other fans can't.