Now, to start of, this point of view is coming from some one who never played the original Halo(had a Ps2 and my computer couldn't run it at the time). And the fact that I don't partially like playing Halo by myself, I have the most fun when playing with friends.
I'm sure everyone who owns Halo 3 will be getting this map because it's free, and free things are awesome and don't come to xbl nearly enough. The map looks alright, it's mainly just gray corridors and rooms with weird test things with Flood Creatures in them and messes on the ground where it looks like some one has thrown up.
The weapons are alot more scattered and alot harder to find then other Halo maps and the rocket launcher is in a fucking stupid place. You need to make a very hard jump to get it witch is made evan harder by the fact that people are constantly shooting you when you try and get it. You need to time the jump just right to get it.
The gameplay is fast paced because the map is so small and cramped. There seems to be 2 main rooms where most of the action happens. Because their aren't as many weapons everyone tends to have the same weapon aswell.
also,
HAPPY BUNGIE DAY!
The action is probably going to be really fast and furious, ramp that up a few notches if you're playing with all rockets. (totally sweet anarchy fun)