MR never claimed to be great for all problems. It main selling points was big-data and easy-of-use. Sure, MPI might blow MR out of the water in term of number-

MR never claimed to be great for all problems. It main selling points was big-data and easy-of-use. Sure, MPI might blow MR out of the water in term of number-crunching, but it is also way harder to use.