I'll admit that I do think think it's the greatest game ever, that title belongs to star citizen and it hasn't been fully released yet, but I personally enjoy it for what it is. So far I'm unimpressed by the mission content but, as has been said multiple times it was only beta and not all was accessible. The couple of starter missions were pretty short. I believe they did say their big focus would be the DZ which is quite entertaining and kept me.going back in even if I was solo.
The biggest downfall that I would see most of all is that since it focuses more so on multi-player and trying to find people that are on when you are is troublesome unless you want to find a bunch of randoms.
I think with time it could be a pretty awesome.