Look at this sexy beast. Could there ever be a better map for competitive multiplayer gameplay? Two fully-detailed, highly-fleshed-out buildings staring each other dead in the face. Loads of rooms and tunnels and corridors within, winding down to the deep colon of the intel room. Ample room for sniper battles right at the top – where, of course, a sneaky Spy or Pyro can also make their claim. (Or, if you're really daring, a particularly-active engie [especially if he uses mini-sentries to troll the fuck out of people coming down the bridge].)
And that's just above-ground! The delectable sewer system provides countless moments for traps and tricks, and easy kills for Pyros, Engineers, and Heavies. (Though Heavies should focus on storming the front of each building head-on with a fully-charged Medic – that's a tip from the top from your old pal Gorse.) Rocket-jumping Soldiers and pesky Scouts have loads and loads of opportunities to bounce all over the place, but they'll have to pass through corridors of eager Demomen who've lined every surface with sticky bombs.
Yes, sir, I can't think of a single map better than our lord, our saviour, our hero from on high:
2FORT!!!!!!!!
Except maybe Turbine. BUT STILL