Let me just take time to explain Batman's combat to those ignorant or denying its depth. The combat falls under the category of "easy to learn, difficult to master." At its core, as others have said, it's a rhythm game. You pay attention to the enemies and tap the right button at the right time. That is the core, but that is not the end of it as it is much deeper and more challenging once you really get into it. The game can actually be pretty challenging on normal difficulties but if you crank up the difficulty and turn off counter icons then things get interesting. The game doesn't just set you up against one enemy type, but instead fills the game with various enemy types holding various weapons that requires you to stay on your toes, and make constant threat assessments while attempting to hold on to your combo string.
You enter a crowd of enemies and some have lead pipes, some have guns, some have swords, some have an electrical field surrounding them, one has a shield, one is a brute, and one has an electric stick, and each one requires a different approach and take down. You start with the lesser thugs building up your chain but then comes that electric shrouded thug, you can't hit him head on so you have to overcharge his field and hit him, but as you do that a thug comes charging at you, you can't dodge that attack you must respond with a gadget attack. Now, you try to hit the sword ninja but he is able to counter your attack and the comes back to attack you, meanwhile that brute is coming down to take a swing. You can't hit him head on, you have to stun him first, but that thug with the gun is preparing to take a shot, while a medic is preparing to revive a fallen foe and surround him with an electric field; what do you do?
I also want to note that again on the higher difficulties without a counter icon you have to be extra good and reading enemy animations and anticipating their attacks. What's more, the game actually punishes you for mashing "X" or "Triangle" if you;re really good then you are able to tap the buttons at the correct time to get a "Critical Strike." Thus, the game encourages and rewards precision as opposed to button mashing.
But yeah, I guess the combat is really shallow and just a button masher.