The AI has never been good. With this update, it seems ever so slightly worse but its still serviceable/playable. I do find that more often I will have a lancemate get inexplicably stuck on the map for no reason. I just switch to them and move them and switch back, problem solved. The DLC adds some great mechs and great weapons, its a huge upgrade over what was available before.
In subreddit r/Mechwarrior5
In a post titled:
Kinda thinking about getting back into the game since I haven't played in a while, is the AI really as bad as some say it is? (No DLCs, playing through gamepass)