First of all, Tarantino is different. This film is more surreal. Tarantino made a good film that was overshadowed by the celebrities involved in the film (Willis, Thurman, and Travolta).
Alejandro Gonazales Inarritu managed to make a film with high emotional content, without the help of greatly known celebirities but with real talent. This movie is not only a great step for Latin Directors but its opening doors for original scripts and real actors. 
Of course its an insult to compare it to Tarantino. I doubt that Mr Gonzales Inarritu would appreciate an insult like that.