Cold-Blooded is an awesome perk its amazing how many times enemies run right past me when im reloading or using a streak because my name didnt pop up. Not to mention I get a lot less sniper/tf deaths when using it.
Awareness is probably only useful in SnD and when using headset. I tend to question the sexuality of anyone I see using it.
I don't understand how people think it doesn't help. I tried this perk combo last night again in TDM and was doing a lot better than my usual. Of course it's not as good as SRP from MW3, but I was constantly hearing footsteps from different buildings/rooms. It's actually easier to flank/rush the enemy spawns with it.
Personally, I think 'better' players will get more use from it. You know the maps / materials well and can guess the enemy spawns. With DS/Awareness, you can gauge where the players will be more easily.
You can make a case for it in SnD and FFA (along with Dead Silence), but anywhere else, they aren't worth a point.
In CoD4, I could hear feet clearly to give me an idea when somebody was near. Same in MW2.That advantage was completely countered by Dead Silence, which was fair. In this game, you have no reliable way of knowing which of 6 directions a LW/Dexterity laser SMG will attack from. It lets these annoying players run around thoughtlessly with no drawback.
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