I wouldn't say Hamilton was as strong this year as he was last year given his starts but he has been the better driver of the two Mercedes boys. People don't realize actually that were it not for Malaysia blow up alone he would be crowned champion already now. Rosberg has had a near perfect year reliability wise.
Realistically, barring reliability, the championship is Rosberg's and he probably deserves on championship. However, he has had the luck of the draw this year.