another game if you just want to hack and slash stuff in is Warhammer End Times: Vermintide
I loved it and pre-ordered the sequel, think of it like l4d2 except with a focus in melee combat and a reason to keep replaying.
I play both Vermintide and For Honor.
Both pretty rad games, incomparable, but great games nonetheless.
See For Honor more like a fighting game focused around this melee combo system with slashing, sweep hits, blocking, parrying, grabbing and what not.
That is very hard to compare with a L4D-like game mostly focused around melee gameplay instead of ranged (but it has ranged gameplay).
But yeah For Honor is a more niche game i think, you either hate it or love it.
Getting a character under control takes some learning the moveset and the mechanics like deflecting and the such.
But it is a pretty fun game if you like that, challenging for sure, mostly enjoyed in PVP-combat.