What, a whiny pussy? I thought both characters did a great job of portraying that.He isn't suppose to be a Vader. Also, I bet kids have a different view of him than adults. Vader was also an incredibly one dimensional character until Empire. Additional, it isn't fair to compare the Kylo character to one of the, if not the, best villains ever.
I felt bad for Kylo by the end of the movie. He was clearly in pain and I think he really wanted to be saved. I loved the character, second only to Rey. He was everything Anakin should have been.