I was one of those people. I rushed through City and thought there was too much stuff thrown at the player at once. Even by the time I reached Strange, I was getting my ass whooped by shield enemies.
After spending more time with it, I realized how many options I had at any given time. Basic combat was liberating, against myriad enemy types at once it was challenging, and it was always fun, but only once I'd played through the game again.
Now that I know what to do against the enemies in this game, it's a similar situation where the challenge comes from knowing what all ways to counter certain enemies and specific attacks. I can shot a brute and cause him to spin around, knocking down enemies around him, do a multi-ground takedown on the guys he just floored, build a combo while he's still stunned then do a batclaw takedown on him. When I first encountered them in this game (especially the electrified and shield brutes), they always broke my combo.
It's no different, fundamentally. You've learned to fight dozens of enemies at once, and that's what's happening here, if you choose to learn again.