Obagi Nuderm System Advice

I have been using the Obagi Nuderm system for 6 months with the 0.05% Tretinoin cream every night the past three months. I no longer flake or peel nor has the texture of my skin improved. My skin care specialist agreed upon evaluating my skin last week that there has been little to no progess. This seems so contrary to all I have heard about the system. Any ideas? I am now at a crossroads as to what to do.