Simple, yet classy graphics, easy to learn gameplay, with room for surprizingly complex strategy.
Starting off with the obvious, the graphics: Yes, they are simple, but so what? Graphics should enhance gameplay, not be all that the game has to offer. The classy and sharp graphics provide an appealing and easy to look at interface, its also clear whats going on, and the sharp angles and neon colours definitley make the game appear like that of the 80's cult classic wargames that it was based off of. The music is also excellent for a game of this type, subdued, and morose, adding quite a bit of atmosphere, but is also not intrusive into the game environment, and in my opinion never distracting. The sounds are minimal, but this isnt really an issue in a game of this type.
As for gameplay, its great, its easy to learn, but there are tons of potential strategies available, do you sneak your subs in in ones and twos to try to avoid detection and minimize losses, or do you bring them in in one group for a massive coordinated strike, should you leave your defenses active and rely on your bombers to chip away? and so forth. The only disappointment ive had so far is with the diplomatic system, and thats mainly cause at this point , though its too early to make any real judgements, feels underutilized, but hopefully that will change as more players come in, and players become more familiar with the game.