Ms project is not used for huge projects. why?

Because Project might not be kept in mind while write the MS Project.

Other applications may be mature and may have, already, captured the market. 

Because Primavera is available and more professional than MS Project.

you may review your project.

:)

I think this is about preference and the choices people make, with MS project you can also plan, manage and communicate information about project efficiently the same way as Primavera regardless of size,