Very insightful and I have never looked at Data the same again!
He has wanted emotions his whole life and thinks he has finally fulfilled his lifelong dream. He is willing to give up his career, his friends for this! He is passionate, adamant for this. He pursues this, until he realizes that he is in fact controlled by an outside force, Lore. When he does, he comes back to himself again.
Again, very insightful and powerful.
I have developed my crush on Data because of this episode. I had one before, but this episode clinched it. "Bad" Data was exciting and scintilatining, to say the least!