Great to hear you like the game a lot.
I have seen the AI do some really good stuff, but like you say sometimes they are just stupid. I hope a future patch will tweak them some more and hopefully this "FSM" editor will be released with some kind of manual so we can do our own AI improvements.
About the bugged missions, many are offcourse caused by bad testing but I think many are also caused by the game itself since many things are just screwed up, like the JIP (which can be prevented if people would actually add another script executing on player connect), but than still there are so many things which changed it will take some time to get everything working like it should :)
But yeah, we are settled for the next few years for sure :thumb