I found the movie depressing as well. In some ways, the actor that played Adam reminded me of my own mannerisms, in others I said 'He's nothing like me at all, NTs will get the wrong idea about Asperger's'.
I've never had a relationship, but I was filled with despair at seeing the one in this film. Even if I could, by some miracle, get a girl to like me, this film shows that it would be very hard to keep her, and to win the approval of her father.
And the one year recovery was unrealistic, too. One doesn't recover from AS, ever. It may get easier as you get older to function socially (I find, frankly, that life gets harder the older I get), but I certainly wouldn't be functioning normally, living alone in another state for the first time, having lost the woman I love, after one year. I'd be a nervous wreck.