This may be a rather simplified version of naval warfare, but even so it is a lot of fun, and it's a game you can load up for a quick dose of destruction, with the simplest controls but a surprising amount of depth and longevity.
I'm a big fan of the Orlan at tier 1. The only other tier 1 ship that rivals it for me is the Erie when it somehow achieves a quite stunning artillery rating. I still have no idea how certain players have achieved that boost, quite possibly a long and involved grind.
These battles are co-op, a team of human players against the AI.