I thought it was quite good. My parents thought it nailed the '70s pretty well, which is cool (I'm always a pessimist about time representation). I'd say I could have done without the sex scenes, but maybe I'm a prude. I mean, geez. Emma Stone.
"For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." - Carl Sagan