Seriously? Have you played the last patch? There is no way that you can say say that it's unplayable and even though fun is a subjective issue, I'm having a blast sweating AI fleets like there is no tomorrow.
Warder
With all due respect mr. Warder but far from everyone consider swatting enemy fleets and no challenge as fun. An no, MP is not an option for everyone either...
For the game to honestly be called complete it has to have an AI that is at least capable of exploiting all of the games feature to some degree and pose a reasonable threat to a players empire at normal setting. You could then allways give the AI some benefit in production/science by increasing the difficulty, but that is entirely different.
Then, there is all sort of MINOR problems... there are allot of MINOR bugs and broken features... all these MINOR thing will break the illusion of readiness for many people. Sluggish GUI and turn times still persists, even though it has become much better in the last patches it is still there.
I like, no... I love this game... but I'm not that delusional that I would actually tell someone to buy it without explaining all the bugs, sluggishness, incompleteness and unchallenging AI... I would just look like a fool for doing so. But I would tell them about Kerberos excellent support and dedication to get it patched up and the progress made so far.
If someone already owns the game then I would (and I have) recommend to start test the game again, but with some reservation for the same reasons above. But, I would do it with an added optimism and that you can now finally start learning this fantastic to be game (all major features added).