^
this
I am not able to play on the server atm, but I guess the AI difficulty is allright.
As this is a PvE Server, there is no challenge at all besides the zeds, which are not really hard to deal with, so without an AI, everyone would get bored very easily.
Helicopters are one reason, why you need to be cautious and aware of an existing danger at all times.
I dont know on which level you are playing, but I can understand, that the AI can be frustrating, especially if you are a new player.
The more time you spent on the server, the more you will get used to the AI and their behaviour and if you keep having problems, ask other players for assistance or some tips, Im sure they are happy to help.