Guess we have to agree to disagree about Arkham/Mordor combat vs. Mad Max.
In Batman, sure, if you do more "stylistic" moves you get a better score, but you can still succeed in multi-opponent combat by just mashing the button because it auto-combos and auto-targets a new enemy once you've knocked out the current one. Go watch the Worth a Buy video about Batman combat, he literally has a camera on the controller of him mashing the same button and NOTHING ELSE and beats up half a dozen guys...I think he maybe gets hit once or something. I played through Asylum and some of City and that was more or less my experience as well.
In Mordor, which I also finished, it was a little better but still became absurdly easy, even against 100+ enemies at once. As long as you hit the counter button at the right time you were invincible.
In Mad Max, it's a bit slower and there is no auto-targeting of new opponents. Also, the counter move can be touchier than in the other games, whereas it's VERY forgiving in Batman and Mordor. If you miss a counter you can very easily get hit multiple times, and you can get more than one guy coming at you at once with only the ability to counter one (unlike Mordor where you can counter two and they never seem to come at you more than two at a time).
As far as how difficult the combat is, I'd have to say from my experience that it's Max followed by Mordor and then Batman as the easiest. I don't think I ever died once from Batman combat in the time that I played those titles.
Assassin's Creed combat is just obnoxious, I guess we can agree there.
So if you intentionally make the combat boring it's boring? I can mash my way through God of War, Devil May Cry, etc but if I told people that those games are dull and mashy because I was intentionally not caring I'd, rightfully, be called out for it and told I'm playing them wrong. If you don't care to try and actually explore the mechanics and see how things work of course a game will be boring. Like I said, games are so reliant on getting an emotional react from the player. If you don't have that for whatever reason then things simply won't click for you. There's nothing wrong with that, but it is what it is. I can play through the Dynasty Warriors games and the various spin-offs and notice the little tweaks and tricks that have changed through all of the games because I'm a fan and I care about those games. Other people will look at them and go "they're all the same, nothing is different"
I wouldn't call Mad Max less forgiving, it's less consistent. The timing on the counters never seems quite right. The amount of time you have never feels like it has any rhyme or reason to it. With Batman or SOM you can get a feel for exactly how long you have to counter something. That isn't there with Mad Max. The pacing is also kind of bad when it comes to fights. Nothing flows right. Being slower is fine but it's slower and that's it. There's nothing more to it beyond simply being an average, very easy, system.