Another vote for vanilla AI from my group. I spent a lot of time going through AI threads here before coming to this conclusion. I tried VCOM but felt like it was doing too much, it pays to keep thing simple IMO. The only thing you really need to do is lower their accuracy to something like 0.20, otherwise it's just not fun.
After playing Zeus for a while you start to realize that nowadays the AI is already pretty good, especially in CQC they can do some pretty convincing maneuvers. Peeking around corners, flanking, etc. There's a few outliers when they see a sliver of you through some branches and start shooting but on average they're pretty good.
Vehicle AI on the other hand is still pretty hit-and-miss. Sometimes they get stuck in place or drive off roads for no reason. Tanks are the worst offenders, it seems their AI has been significantly downgraded since OFP. I'm hoping BIS will address this in time for the Tanks DLC.
