Rats Nest is amazing. A great tip for that map: instead of jumping in a warthog or running for rockets, go for the hammer. Sit near the main back entrance (facing the Parked Pelican) and wait patiently for those angry warthogs. Theres nothing better than coming out of the back door and slamming a warthog filled with 3 people flying off the edge to their death. I used this method at the start of a match, sent 2 warthogs flying off the cliff, 5 kills. something different, and totally unexpected. Im sure bungie planned this, and thats just friggin genius.