Was in the aforementioned game with Drow. Done some more testing. To quickly summarise, it seems to me, that if you're in a 3 or 4 man squad, and an Antagonist invades, the AI enemies will become stronger than they normally are. My MMR was around 90%, and other players in the group were probably around 65-80 or so, so maybe the game was tipping the scales in favour of the Antagonist due to MMR differences. Not sure what Drow's MMR was/is. Usually playing matches with friends at around the 70-80% difficulty range. Whilst the enemies at that difficulty are fairly tough, they're not nearly as strong as the ones you go up against when you're in a squad versus an Antagonist.
Had another similar experience on Low Blow, with an AFK Antagonist, whilst being in a 4 man squad. The Hades troopers were doing around 200 damage in one melee Strike, a rifleman could down anyone that wasn't 5th Council in a short burst of fire, and they had around 800+ health or so. Friend playing Schleuder Ginebra was landing 500-600 damage ricochet shots and wasn't killing regular Hades troops in one shot. Even the engineers had over 400 health. Moreover, they were constantly spawning, so we couldn't make any headway and were pretty much trapped in spawn. Had to surrender.
Played a few matches against Antagonists in solo queue with random players, and the AI enemies in those situations were not as overpowered as the two above examples. However, I was usually paired up with lower level/lower skill Raiders, going up against a decent to strong Antagonist player. Probably MMR system trying to balance things out. Somewhat stressful.
Against skilled Antagonists (70-75% Antagonist skill), whilst playing in a squad, the AI enemies were still stronger than normal. Managed to win a few games despite this, but it was a huge slog, and the rewards were rather paltry. In most cases, the AI enemies are so strong that the Antagonist doesn't really need to do much to win. System seems to greatly overcompensate if a lower skilled Antagonist goes up against a higher skilled squad of Raiders. It's more expeditious to simply surrender, and queue for another game, in such situations. I don't really like to lose due to such factors outside of my control.
Seems like a recent change. I was playing in 4 man squads at the beginning of the Hades update, and never noticed the AI being this overpowered. Likewise, when playing Antagonist, the AI were not really winning the game by themselves for me. I might need to play Antagonist mode a little, and see how strong/weak the AI is, to see if it has any relation to my MMR.
Antagonist mode largely a waste of time. Raiders stand to gain very little and lose a lot; in time, XP gained, and rewards earnt. Antagonists don't really earn all that much, even on a win, when compared to just farming in a 4 man group with Bounty/Treasure Hunter weapons.
MMR system and uncontrollable difficulty levels just seem to be made to punish players that win consistently. I feel like I'm on a treadmill, and someone's constantly raising the incline. Game is already a huge grind without having to deal with queue times, ever tougher enemies, and Antagonist invasions, along with the stress of having to carry randoms and worrying about MMR loss. It's just so tiresome.
Would rather have PvE and PvP modes separated, and selectable difficulty levels in PvE with scaling rewards. Playing games with lower level players at 50-60% difficulty is such a cakewalk, and the rewards are pretty much the same as when beating maps at 70-80% difficulty.
PvP mode should have vastly inflated rewards for those who participate in it. Double, triple, or even quadruple than what it is now, for both Raiders and Antagonists. Should probably scale rewards for Raiders based on level completion, rather than through binary win/lose state. If they get through say, 50-66% of a level against an Antagonist and lose, their rewards should be about the same as if they had completed a level without an Antagonist. Antagonist rewards should probably be more weighted to kills and time delay, rather than outright winning or losing.
People should feel happy/excited spending time in 4v1 mode, win or lose. As it stands, mostly a waste of time, that people can't opt out of.
Hope developer reads. Not sure. Will await without expectation.
P.S. In Shock map seems overtuned at the moment. Played a 73% difficulty game there without an Antagonist, and 5th Council enemies had higher health and were dealing more damage than normal. Playing In Medias Res and Weapon from the Past at around 70% difficulty, the 5th Council enemies there were much easier to deal with. Not sure if it's some sort of bug/glitch. Don't recall In Shock being this difficult at beginning of Hades update.