Strongly Recommended Game types: Capture the Flag, Assault, Infection
Other Recommended Game types: Slayer, King, Oddball, Juggernaut
For CtF, each team starts behind the man cannons that spew fusion coils. The flags are both in this room, so when stealing or capturing, beware the flying explosives.

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=81298670
The man cannons at each base spawn fusion launch fusion coils every 30 seconds. Watch out!

Bungie.net : Halo 3 File Details
A view across the central corridor. This is fastest route to take the flag across the map, but the most exposed.

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A look into the bottom middle of the map.

Bungie.net : Halo 3 File Details
It may be safer to travel across the top level with the flag, but it sure takes longer.

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From this perch, you can pounce down on people below you.

Bungie.net : Halo 3 File Details
This is one of the two outside corridors that are on either side of the top level. The yellow A signs point to one base, and the red B signs give directions to the other, but don't let that convince you that you won't get lost.

Bungie.net : Halo 3 File Details
The top level has several branching hallways, among which length and security are inversely related.

I should also note that this is my favorite map that I've made. If you only download one map from my file share, make it this one.
Thanks.