The kid looked good, but I'm not a huge fan of starting rookie quarterbacks. Eli Manning needed more time before he started, same for Kyle Boller. Let him sit the bench for a year, and he and Thomas can take over the offense next year. Thomas cold start this year, there isn't too much of a learning curve for lineman and Quinn could benefit from that extra protection.
I was only answering your question. He was in against a third string defense, which is comparable to a mid level starting squad for an NCAA team. Anyone can look accurate when someone is open, but I can't say for sure because I haven't seen him yet.