I think he's meant to be liked. He's lost on the dark side, sure, but he's human. He has fears and goals. He struggles. Vader was ******* awesome on the original trilogy, but he was not relatable at all. He was no human, not untill the very end.
I think they did with Kylo what they tried to do with Anakin in the prequels, with the difference that they didn't failed miserably this time.