The game is basically a hybrid of Shadow Of The Colossus, Super Castlevania 4, a bit of Devil May Cry (the combo buying part) and Prince Of Persia (the platforming IS taken straight out of the Sand of Time trilogy)...so I guess it is like God Of War since that's basically what God Of war is. But calling it a God Of War knock off is like calling God Of War 3 a Dante's Inferno knock off because D's I came before GOW3 on the PS3. And as for mounting monsters....it's just a coincidence that both GOW and LOS did it. If you insist that one must of copied off the other (I don't believe that is the case though) you got it backwards, the fact that you can mount enemies was announced for LOS long before it was for GOW3 and I doubt Mercury Steam had inside information on the fact that Santa Monica Studios where doing this (seriously, look it up). Besides, they control completely different.
EDIT: I also noticed a lot of people think this wasn't meant to be a Castlevania game...it was. The original Lords Of Shadow trailer was shown to Konami as a 'prototype' of what Mercury Steam wanted to do with the franchise, but they didn't know if Konami would like it so they just called it LoS until Konami responded giving them permission to make it.
EDIT: I also noticed a lot of people think this wasn't meant to be a Castlevania game...it was. The original Lords Of Shadow trailer was shown to Konami as a 'prototype' of what Mercury Steam wanted to do with the franchise, but they didn't know if Konami would like it so they just called it LoS until Konami responded giving them permission to make it.