Breath of the Wild has an incredibly versatile combat system that, when taken advantage of, has the potential to make practically every fight unique. I saw a video of someone fighting off a bunch of silver bokoblins, moblins, lizalfos, and a gold lynel in Master Mode, using pretty much every trick the game has to offer, and in another video I saw somebody do something incredibly subtle and quick in taking out a remote bomb, korok leafing it, and blowing it up in the span of less than a second. The ability to be creative like that makes it a top notch combat system.
I'm also a big fan of cooldown-based MMORPG combat systems. World of Warcraft is an extremely popular example, though the one relatable to me is Final Fantasy XIV, which has a similar system to WoW only with a shorter global cooldown which actually allows for more fast paced gameplay due to all the skill weaving that is involved.
I also love the combat system of the Ratchet & Clank series, specifically the more intuitive system introduced in Going Commando. That game introduced strafing, which is one of the things that makes the gameplay of the franchise so fun and strategic. The weapon diversity is fantastic and the enemy variety is pretty good all around.