I don't disagree that it was a missed opportunity for a story driven single player campaign, but I can tell you the exhilaration of doing battle with a human opponent is truly fantastic. There is a lot of AI still on the PVP servers and there is a PVE (only vs. AI) server running as well so there are other options so perhaps if you ever see it on sale give it a thought.
By far one of the best early access games I've purchased (alongside Space Engineers).
This is a screenshot from one of my first large port battles (many patches ago before GB and USA formed an alliance). So many sterns to rake and not enough guns reloaded! I think three or four ships blew up in that battle and a great time was had by all. Don't even remember who was attacking and who defended just that we all had a fun time. Multiplayer can truly be an absolute blast!