It is not just good, it is AMAZING. A must watch. Watch Fate/stay night too, watch it first actually, not nearly as good but still worth a watch and makes Fate/zero all the more awesome.@Arkonov - is this show good fate/zero any other plz i need a list thanks a bunch man.
Also, have you watched the following animes:
Fullmetal Alchemist
Fullmetal Alchemist Brotherhood
GUNxSword
Fullmetal Panic
Cowboy Bebop
Samurai Champloo
Soul eater
Baccano!
Durarara!
Chrono crusade
Blood+