Not following all the pizza stuff, but it seemed to me that /r/politics had a lot more misinformation in it during the election than any other subreddit including the_donald.

Disinformation isn't the same as misinformation. A sub as big as /r/politics has a ton of noise but the conspiracy stuff was kept pretty well under control. You can't say the same for a sub that hosted a fawning AMA with Alex Jones.