People seem to hate on the Hobbit a lot but at the end of the day its different to the LOTR in its very nature.
LOTRs is a war movie, where Sauron has come back and the peoples of middle earth must unite to fight. Therefore, its bound to be more gritty and serious.
The Hobbit, on the other had, is an adventure story, set in a time of 'peace' for all intents and purposes. Also, the story is told from the perspective of Bilbo, who would likely remember it in a more humours and lighthearted way.
For me, both trilogies are very good in their own right, but I do accept some of the CGI criticism for the Hobbit.
Azog looked liked a cartoon.