How is killstreaks overpowered?

Carry the STRELA and get the scavanger perk. Nothing will last more than a few seconds, especially if 2 on your team does this.

As for dogs, shot the damn things. They die from just a couple bullets anyway.

Campeign wasn't anything special though, but I really like zombie mode. Unfortunately the maps are getting more and more gimmicky with each release.

I don't mind the perks and upgrades... and the dogs are a nice change of pace, but now it's just a bit over the top. Multitudes of perks, no good places to make the final stand, a boss that makes it impossible to camp? Crawling zombie things that spew out nova gas, monkeys that steal perks and does AoE damage?

What happened to the good ol' maps from WaW?