Oh it is awesome! I love all the references to previous material I've been following for years. Adascorp, all the Kotor references, the story behind Revan's mask, Carrick station... very awesome.
Naga Sadow shouldn't have a tomb on Korriban. It does look good though.
Like the ancient kings of Egypt, the Sith have an obsession with their legacy. Sadow most likely had it constructed while alive. I assume this because Marka Ragnos' tomb was fully constructed during his burial ceremony just after his death, plus Naga Sadow had the Massassi build the temples on Yavin IV while alive and well. And that would include his new tomb.