It's not exactly a rare thing that we receive material that is fine musically, but fails miserably when it comes to the vocal performance. Really good vocalists are hard to come by!
British newcomers Pantheon have run into the same problem as so many others do; their material ranges from alright to really good across the four tracks of this promo EP, but bassist/vocalist Simon can't lift the material to something you'd want to keep listened to again and again with his flat and undynamic performance. At best his style lands somewhere near Matt from Evile on a very bad day, and his best performance is the beginning of Silent Apocalypse where he basically grunts. Otherwise Simon tries to be melodic in a way that he can't handle.
The production of the EP isn't perfect, but this doesn't mean that you can't hear the qualities of Pantheon. The style is somewhere in the interface between thrash and heavy metal which by all means is fine. Voice of Hate has a touch of modern thrash, but otherwise we're not really moving beyond 1997 stylistically (not a bad thing).
All in all a fine promo effort, but something seriously has be done about those vocals in my humble opinion.