This is seriously pumping and distorting. Instead of trying to glue a death metal mix with compression, try with subtle tape saturation or some analog console saturation. Search google for FerricTDS, it's a great tape saturation and compression plugin that will help glue you mix together keeping it's intelligibility intact.
To answer your question, if i heard this mix for the first time without knowing who did it, i'd think it was some large studio with a pretty big budget, except for the infinite gain reduction applied at the mastering stage.
Just remember, make it loud, but don't distort it.