I love tf2 classic but it's definitely not at all balanced, most of the new items added (like the heavy anti aircraft cannon) are super unfun and not very interesting for the game. Just to illustrate it for people who haven't played the mod before:
- "oops my med and combo scout got blown up instantly by dynamite haha"
- "dang my flank scout walked around a corner and got -140 dmg blown up by a roamer hiding there with the RPG"
- "a 450 hp heavy spammed me around a corner with an air detting projectile that he has almost unlimited ammo for"
- "an engi used a jump pad and got a sentry gun and heavy on a place that's not supposed to be accessible"
- *everyone gets mowed down and out DPS'd by pre-nerf heavy with no damage ramp*
.
That said, I'd definitely play some pugs in it, but to get comp people to try it out you'd probably need to have someone with FTP to the server who can easily at will change the whitelist / class limits.
Example: people would probably want to try out banning heavy (old minigun is absurd) or pyro (way stronger than current meta tf2), or banning specific weapons (like dynamite or RPG), not because they're objectively OP, but they're just not very fun mechanics to play against)
The 4 team koth game mode is pretty silly and would likely devolve (everyone ends up shooting red team or two teams team up) but it'd be entertaining to try a pug with