The genre of pagan/viking metal is slowly becoming over saturated. It seems like every time I turn around there's a new band that sounds exactly like every other pagan/viking metal band. Varg's Wolfskult seemed fairly original at first, with heavy thrash influence and black metal shrieks, and pagan in lyrical theme only. There are no bagpipes, flutes or other instruments normally associated with this genre, thus setting themselves apart from the pack. However, this is pretty standard thrash metal. You can hear the same thing listening to a Destruction album.
The musicianship is good, but not anything special. The riffing is heavy and fast, and the solos are well written. The vocals are performed with anger and fit with the thrashy music well. However, after a few tracks, each song starts to blend into each other. Nothing about any one track stands it out from any of the others.
If you are looking for an album heavy enough to bang your head, then this will work fine. Otherwise, move along. There's better thrash out there.