I played it with some friends and was having a really good time for a while (we started when the game launched), but it didn't take long until we got tired of the same game loop over and over again without much else to do, I don't know if things have improved since then on that aspect
It's been fun so far. Haven't had much repetition. There's a handful of "continents" that have a different feel/way to get the ark. Once that is all done I don't think I'd see a point in playing post-game unless I made a new char.