Never seen a worse first performance in my life.
You must be very young. Because I feel like I've seen plenty of worse first starts by QBs with stars on their helmet. Especially after Troy was lost in 2000.
DiNucci had a bad game, sure. A passer rating of 64.6. A completion percentage of only 52.5%. 0 touchdown passes (but, to his credit, 0 interceptions either). 2 turnovers. Only 180 passing yards (plus 22 more yards rushing). 3 scoring drives. Definitely bad.
But the worst?
Anthony Wright's first start in 2000 was worse.
In 2001, we had a couple of dreadful first performanes. Quincy Carter and Clint Stoerner were both much worse passers in their debuts. Both had completion percentages in the 40's. Neither threw any touchdowns, but they threw interceptions and each lost a fumble. Passer ratings of 14 and 40. Neither could even crack 100 yards passing on the day.
In 2004, Drew Henson made his first start and he was a nightmare. Got himself benched during the game. Completed only 33% of his passes. Averaged 2.95 yards per passing attempt. 0 touchdown passes, 1 interception. Passer rating of 7.6. To be fair, it's a small sample size because he didn't play the entire game. Maybe he'd have had a great 2nd half and turned it around. (And I managed to keep a straight face while I said that last part.)