Mapleenigmafastest way to kill the gameI agree with you in this case but wasn't there a CoD4 promod that still remains pretty popular? What changes did that mod make, and does anyone know why that didn't cause a harmful split? Or did it ruin CoD4's comp scene?
1) Promod was a server-side mod so to play it all you had to do was join the server and play.
2) Promod refined what CoD4 already was as a shooter, it didn't re-define the game (think CSGO competitive matchmaking). 6v6 TF2 gameplay is VASTLY different from standard 12v12 TF2 gameplay. In CoD4 you could join a promod server and still be a contributing player if you ran around mindlessly shooting things because that's all you had to do. In TF2 however, you can't join a 6v6 "server" and run around with your favorite spy loadout or sniper loadout. First you'd get yelled at, then you'd get frustrated because you can't do anything but get stomped on by the better players playing inherently better classes.
3) If I'm not mistaken, Promod came out only a few months after CoD4 was released, so there's that.
In terms of what the mod changed (out of memory, other people might remember more than I do):
-slightly less visual and aural clutter on maps so it was easier to see people and hear footsteps/reloads
-guns were more accurate with less damage (I think less than regular CoD, obviously WAY less than "hardcore" [lol]) and more recoil
-removed killstreaks (this didn't make everyone cry because everyone had the only 3 killstreaks in the game, not a million unlockable ways to dick someone like in later CoDs)
-changed the way perks worked from a "TF2 loadout A has these perks" setup to a setup where you choose your perks mid-match, and everyone in the match has access to all the same perks.