I just got the new game a little while ago, and while it is pretty excellent, I've heard things about the storyline. Is it really that short? How close is it to Diamond and Pearl, which, in my opinion, had one of the longest and best storylines in the game? For those who have finished, will I still be able to have fun with the game even after I've finished the storyline?

Will it ever be worth trading over all my Unova pokemon?

Pic sort of related, but not really.