pretty good. He made some good reads, delivered the ball well on most of his throws, and made some rookie mistakes, which is to be expected.
Anyone expecting him to come in and be an instant phenom doesn't understand the talent at the NFL level.
What really counts, though, is what he does this week in learning from the mistakes he made, building on the things he did well, and what adjustments he makes to the way he reads defenses and how he reads what his receivers are doing. The potential of him is about to be shown in the next couple of weeks.