Great game, but is not a survival horror game like the previous games, more like action.
Once you have beaten the game, you can unlock harder difficulties and infinite ammo, eliminating the whole "Survival horror" part of the game, but the harder difficulties will cause even the most skilled resident evil expert to struggle against the unforgiving enemies.
As for customization, you can upgrade your weapons, unlock new ones, and buy new skins for single player using Microsoft points but that's about it... Also you can buy new modes (Lost in Nightmares, Desperate Escape, and Mercenaries Reunion) and characters for Mercenaries Reunion.
Game play: 2.0/2.5
Graphics: 2.4/2.5
Sound: 2.0/2.5
Customization: 1.1/2.5
Total= 7.5/10