I've played that and it's not as good as the first and original Team Fortress for quake which I have played constantly in 1997 almost as much as I play TF2 today.
People are just bitter about the lack of pro concussion grenades for their medics and other grenade spam tactics (which pretty much KILLED tf and only remains as such today with non-vanilla stupid mods running servers). But i'm not. I love TF2.
So yeah, haters gonna hate.
I also have played Fortress Forever a lot when it came out, then it had the same 'pro' grenade abuse problem.
plus tf, tfc, ff don't have the charging targe/splendid screen + eyelander/persian persuader, for their demoman so it sucks by default