Abandon looks pretty unfocused. I don't know much about making good maps but it's too sprawling. Just a bunch of trails and passage-ways surrounding two off-looking bases.
And that front area's reminiscent of Spire which is discouraging.
Combine Midship, Spire, Backwash and Guardian.
One base is like Midship bases, many ways out or in. The other is an open area, like the Spartan spawn in Spire Invasion. Backwash and Guardian for aesthetics, with human buildings. And the rest... well, something.
Beatiful looking map. Looks like it could be awesome for one-sided modes but whether Halo 4 has those is unknown.
Team Slayer and FFA Slayer will probably work fine on the map, if it is as balanced as 343i claims.
Me, i like it because it looks like it offers a lot of oppoturnities for close range weapons. And general melee/CQB chaos, if the gameplay is remiscient of Halo 3, i will thrive there. The more chaos, the better for me.
EDIT feels like one of the HaloGAF crazy-nights, though this time this place turned into a poetry corner.