What's an alternative or even better multiplayer FPS than CS:GO?

Dirty Bomb
Free to Play(will be) FPS Multiplayer Shooter Action and even have competitive mode
++++++
YOU CAN OPEN CASES !
+++++

team fortress

War Rock....trolololol

Insurgency, Planetside 2 ... umm, Unreal Tournament 2004? :D

Quake 1

BF3 & BF4 are good and the games are still alive.
I play CS but I don't really enjoy it. I like a FPS game with larger scale.
Or maybe you can try Planetside 2. It's fun playing with hundreds of players at the same time but sometimes it can be really chaotic to point you don't know what you have to do.

ppl seem to compare Insurgency to csgo idk if it's good tbh, but it IS "realistic" shooter

Every other popular mp shooters like Battlefield, Call of Duty and many others.

It hard to find FPS worst than CSGO.
CSGO is slowpoke, very unbalanced, bored shooter

Quake III Arena
Unreal Tournament
Battlefield 2
Rainbow Six 3 and below
Ghost Recon
SWAT 4

Any other fps to be honest, but in my opinion BF3 , BF4 , BF Bad Company 2 .

Let's see... I recommend Insurgency or Battlefield 3. Both games are similar to Counter-Strike (especially Insurgency) in terms of "team vs team" gameplay.

Battlefield 2
Battlefield 3
Battlefield 4
Insurgency
Arma 3

I don't like shooters, but ... red orchestra / killing floor are good games.

Rising Storm/Red Orchestra 2

SF2 and crossfire are great games

Team Fortress 2 FTW

Counterstrike games are propably the worst,more random,casual,low skill fps you can play and because of their gameplay is beyond fixed.Valve with the support of cs:go killed multiplayer fps genre and now everyone plays this atrocious game.

If someone disagree with me he don't have experience with other good multiplayer fps or he is an old cs player.

i can't suggest you other fps atm than cs go for the simple reason they are all dead somekind.

Since you said L4D2, If you have friends to play with, I can really recommend Killing Floor 2. I'm crazy about it ATM and have put in 8 times more hours than GTA V.

TF2 and/or Overwatch.

I loved playing Battlefield 1942. Great intro and song

Is CS:GO good? Yes, it still is.
Is there a better multiplayer shooter? It depends on what you like.

Insurgency.

Halo.....It's Xbox exclusive though.However,you can always download it's rip-off "Storm united" on steam.