The review in the Canadian Sun Media papers was written by a fan of the books who compares the film to David Lynch's Dune (and not in a good way) and says its problem is it gets bogged down in the politics and everything. Plus he wants to know what marketing genius decided to drop the "of Mars" from the title:
One interesting comparison is he points out how Lucas gave us a simple accessible story when the Star Wars movies began, and he saved all the political stuff and scientific explanation for the Force until later. Apparently John Carter goes overboard with the detail right away and apparently tosses in a Jar-Jar Binks for good measure, the reviewer says.
The big difference for me between John Carter and Avatar is that we knew Avatar was coming ever since Titanic was still in the theatres and Cameron's people never let us forget it. I didn't even know there was an adaptation of the Burroughs novel until about two months ago when reprints of the original books and comics began showing up for no apparent reason.