Well, it was to be expected. But yes.

Slim majority of 18 votes, and a lot of people don’t like him.
Merkel actively kept him from power until she was done with politics, privately saying he’s dangerous.
He’s a ruthless, but not very good, power player with little empathy or ability to reach across the aisle.
The Social Democrats were basically forced into the coalition as the only option to get a majority without the Nazis.

Cause nobody likes him