BIS has achieved a huge development in the field of ai, comparing the first year of arma 2 and now arma 3. Of course there is pretty much work to do - but they have to keep focused on the real big issues. At this point I'm not talking about karts or fun-stuff like that, i can hardly wait to see balistics fixed, improved choppers, correctly working windows (topic of grenades which cant fly through specific one) and many little things.
I do think it is easier for the community to improve the ai, than trying to fix things which are rooted deeply in the engine (like the chopper flight-model).
I could imagine that many people think that they bought a product, stuffed with everything you need - to have a fabulous playing experience ; but thats not the case!