It's got launch pads so you can practice your air shots.
The map is a long hallway, so you can practice your headshots.
It's got Scouts, so you can practice your Batting.
Pretty much if you're new to TF2, or just need some extra practice without wanting to go online and get your ass severely kicked (you know who you are), just try this nifty little map out. Hell, Valve supports it.