What do you think makes a good battlemap?

There isn't a one size fits all set of rules, but I like:

• multiple exits and entrances. If the party needs to flee, or there are reinforcements, then they're should be a few ways on and off the battlefield
• cover. A scattering of solid items to use as full or partial cover makes it easier for characters to move.
• multiple paths allow units to circle behind enemies.

What do you look for in maps?