Yeah, well, that's what I called rudimentary tactics. There are games that can send a group of enemies circle to your side or rear, as well. Rudimentarily that's exactly what humans players would do as well. No games so far try to guess what you would do next or would really adapt to your following actions, but that's not really necessary in cases like this, where there ought to be a whole bunch of AI controlled NPCs vs few humans, which is typically the situation (as opposed to some mega monster last boss battle).

Let's not forget, however, that this game engine already supports a highly advanced AI like Yui, so theoretically there could be NPCs that would use sophisticated tactics. I just won't believe in that before I see it after these couple of eps. GGO looks like a simple shooter, so it would have no use for intelligent enemies and likely the players would dislike them.