What I heard in this music, what made me feel the atmosphere so this orchestral part is done pretty well. I like the sound of bells, strings and some other instruments, the pad is also well made.
Build up perfectly hints that this will now be a dubstep drop.
Yes, about the drop, I do not really like it. But it's not so bad. What exactly I did not like about, is the predictable growls. When you hear the first, then the second and then the third on the fourth ear already bored with these dubstep growls.
I also think that there are 3 styles mixed in the drop, this is Code: pandorum + Au5 + some Xtrullor sounds. And it sounds absolutely cool! You still have something to work on, good luck!