It feels like a well balanced teamplay map.
The problem with Setons is that it's not really a 4v4. It's four separate 1v1s, and if one of your teammates fails to do their job and secure their part of the battle, you're probably going to lose. The bases are so far apart that every player is isolated and the large distances make air dominant.
Dual Gap is sort of like a chokepoint fight, but there's an open land play area where you fight it out in the open for a large amount of mexes, but not so many it's a guaranteed loss if you lose them. It has strategically placed reclaim. The front-most player on each team gets first access to a large pile of rocks right at the front, giving them something to compensate for the dangers of being in the front.
And the Tropical Resort Edition includes a large enough area of water that you can send destroyers and battleships to help out in the middle mex fight, yet the narrow chokepoints into each base mean that battleships are not dominant like they are on almost every other navy map.
All the player's main bases are located close together so you can pool SAM coverage making bombers not be dominant. There's 6 players on each team and 3 main objectives (2 groups of mexes and the water), so there's lots of overlap between players so you actually fight as a team and not as 6 separate 1v1s.
What do you all think? I just found out about the map today. It seems to play really well, and I've noticed that Dual Gap is beginning to take over in terms of games being hosted.