In my opinion TF2 is one of the greatest free shootergames on steam.
Its a classbased action shooter with 9 diffrent charachters, lots of gamemodes for example: capture the flag/control points or payload and it also has a whole bunch of great maps that are (most of them) really fun to play. There are diffrent playstyles that need other loadouts (weapon combinations). But after telling you after all of this the most fabulous thing about tf2 is the community. The game came out at 2007 and there are still people that love the game very much. They play with each other on communtiy servers, share their opinion in discussions and trade their items on community made websites like bakpack.tf or scrap.tf. And if you also want to expierience a game that is 11 years old but still has a great community and inspired famous games like overwatch, then you really should give tf2 a try. - jaspyr out