Massa isnt so bad. He is a slow learner, who tends to peak towards the end of the season after he has mastered the car. Last year, the removal of driver aids hit him hard in the first few races, as did the wet racing, however, as the season progressed, he learnt how to handle wet conditions and driving without aids, which culminated in him winning the final (wet) race.
Funnily enough, this forum berated Massa at the start of the season, when he struggled without aids and also predicted that it would suit J.Button. How wrong they were - Massa finished only 1 point behind the World Champ, while Button struggled to contain his almost retired teammate.