"Terrible," he said.
The quarterback committed four turnovers that led directly to the Bears storming back from a 17-point deficit.
"I think he was seeing things good," he said of Kaepernick, per the Sacramento Bee. "He threw some pretty darn good balls that got intercepted. ... Tip of the cap to the defense."
Harbaugh's players, however, weren't so complimentary to the Bears, admitting they blew an opportunity for a 2-0 start.
"When you have a team down, you have to put your foot on their throat because nobody's going to quit in this league," Anquan Boldin said. "That was evident tonight. They continued to play."