I hated Sivaji and Ghajini too, so I'm not sure what your point is. If someone disagrees with you on a film they have terrible taste?
As for the makeup, when the character required mild adjustments (like Balram Naidu) the makeup was good and the character looked like a real person. When Kamal tried to do extreme transformations he looked more like the puppets in Genesis'
Land of Confusion video

Kamal's makeup in Anbe Sivam worked because it was simple and the film wasn't about the makeup. With Dasavatharam the main selling point was one actor playing ten roles in a film. Kamal is too good an actor to hide behind poorly done rubber masks anyways.
Dasavatharam was a big hit, so you can't claim that the film was shunned or misunderstood or anything like that. I admire Kamal bringing science and religious ideas to a Tamil film (though the science seemed half-baked). At best it is a thriller/potboiler that has some ambitions beyond the genre, but is overly obsesssed with the Dasavatharam concept and has some rather laughable points to it (Kamal's American accents, Mallika Sherawat's presence, the cancer-bullet thing, etc.)