Favorite: Countdown - I prefer symmetric maps, and Countdown is the best one. Only thing that bothers me a bit are two CQC weapons (i.e. shotgun and sword) on a map where it’s very easy to camp in narrow parts of the map and where most encounters occur on rather close range.
Least favorite: Hemorrhage - I disliked the shoe box design in H2’s Coagulation already, and vehicles are far too numerous on that map.
Favorite: Highlands - Not only breathtakingly beautiful but also very good to play at. Doesn’t feel empty in 4-vs-4, and doesn’t feel crowded in BTB.
Least favorite: Breakpoint - Has a few severe design flaws like being able to DMR/snipe virtually everyone from the ridge, and the tunnel allows for bomb arms in less than 30 seconds.