I discovered this game in the summer of 2015 through a friend. At first I didn't really fully understand it, like the vast majority of new TF2 players, but i tell you, I was HOOKED, and did I never want to stop playing it. Despite only being loosely story driven and much more of an online FPS, the characters still somehow manage to be some of the best in fiction. Even with the pyro, a faceless maniac with little to no identifying bodily features still thrives with personality. Instead of the full cosmetic packages that you're unable to mix and match in OW and Fortnite, TF2 allows you to create different combinations of cosmetics, and you can even paint them and add attributes to them (strange, unusual, etc.). Also, unlike many, many other online FPS games, TF2 takes the vastly unique route of being cartoony, self-aware and silly, instead of the COD/OW route of being serious all/most of the time. Also, the community, (despite having some unfavourable people in it, as with most fandoms) is very creative, especially those who contribute to the workshop. Although, it's quite disappointing that everyone worships fortnite and overwatch like it's going out of fashion, they ignore the much, much better alternative that was there the whole time.
10/10, would certainly recommend.