I don't know why it would matter, but Einstein didn't hate quantum mechanics. He literally got his Nobel prize for his role in discovering quantum mechanics. He is one of the earliest people to propose that light exists in quantised packets.

He had some strong opinions around interpretations of quantum physics, but that isn't even a question of science, it's a metaphysical discussion.

While we're at it, Einstein also wasn't a bad student, and he didn't hate mathematics.