Some goods, some bads.
the good.
Your beat: is pretty rock worthy and gives the song a good back bone to stand agenst.
The rythem: isn't bad at all and has that fight scene feel to it.
Ok, the bad.
Slayer: yah, just...slayer. Find yourself some better guitar vst's from the audio forums trust me that will help big time. Slayer isn't super bad but people get tired of hearing it in music really quick hah.
Lack of instruments: This song would be so much better if it wasn't just guitar, slight bass instrument, and drums. You could make it shine a bit more if you got a lil more imaginitive with it.
All in all thats all i have to say. So keep it up and if you need help finding some vst's and or soundfonts gimme a holla!
Wyldfyre1