1. Power Surge is an underrated map. But it is my fav. It's got everything. Sniper spots, CQ combat, hiding spots (good for chamming), and is all and all a great medium sized map. The best mode for the map is S+D.
2. Death Room is my second Fav beacuse it is intense total non stop action.
In order of preference:
Junk Flea, Snow Valley, Pump Jack, Sand Hog, Two Towers, Death Room, Power Surge, Grave Digger, Grey Hammer, Showdown, Cold Seed, Rattlesnake, Waverider, Overdose, Brushwood, Warhead, Roadkill