I have! I think it's the best one of the four, but if you didn't like the others, you probably won't like this one. Unless Shia Labeouf was your major complaint, because I do think that Mark Wahlberg is a big step up.
I did enjoy it. It's still a super dumb and ridiculous movie, but I did enjoy it.
I'm still slightly clueless as to the whole cake-sitting thing. I know it's been mentioned a few times slightly vaguely on bombcasts, and I think I remember something about Ryan's wife giving him a cake for sitting on, but maybe I'm mis-remembering it?
I believe what happened was that Ryan either saw, or heard about a burlesque act where a scantily clad (or maybe nude?) woman sat (bare assed) on a cake. So, Ryan decided he wanted to do it too, so his girlfriend bought him a cake, for the specific purpose of sitting on. Which he did (bare assed). I remember Ryan told the story during GDC last year (pretty sure), on one of their livestreams.