The Battle System isn't has bad to me anymore, now that I've nearly mastered Melee and have it at Expert (Expert takes away the bad lighting penalty to hit accuracy for any Melee weapon).
This game is fucking awesome. The incentive to be a thief character is very high (was able to steal one of the best non-schematic weapons fairly early in the quest). There enemies in this game are also greatly varied. The schematics system is great too (I'm decided to become proficient in bomb making). Flash Grenades are actually useful.