It's not a terrible game, but it's pretty much an inferior L4D clone in every aspects. The game looks decent and the gunplay itself is fine, but everything else is subpar and forgettable.
Levels are very generic and boring. There are no fun and exciting settings like in the L4D games. No Thrash Metal concert, no airport, no roller coasters, no Mardi Gras parade... just some generic streets, warehouses and other unimaginative locations. The atmosphere is also pretty dull and doesn't even feel like a horror game.
Special zombies have some very generic designs, and they are very bullet sponge-y and tedious to fight.
No gore effects, no memorable music, no mod support... but plenty of micro-transactions.

I'm sure you can have some fun with friends, but honestly you should just replay L4D 1&2 instead.

The Ascent is very pretty. Neon Giants managed to create an incredible Cyberpunk city filled with small details and jaw-dropping vistas. The soundtrack is also very good, it's mostly ambient tracks mixed with synthwave and it fits the game perfectly.

The problem is that it's not a very good game to play. The quest designs are very generic and repetitive, and all the dialogues and characters are pretty forgettable. The map can be a pain to navigate, with a lot of back and forth. The difficulty can be all over the place, and the loots are not unique so it's not very satisfying (you'll end up finding the same shotgun 7 times in one session etc...)

So if you expect a good looter shooter, there are definitely better options. But if you like Cyberpunk settings and you just want to explore an impressive futuristic city, it's definitely a game worth checking.