The Camera Spike has the potential to get you more kills if it's in the optimal location, but it replaces your mini-map. As others have said, I won't use it until I'm accustomed to the maps.

A single claymore will only get in one kill most of the time, but it's still a good way to cover your blind spot. Even if it doesn't kill the enemy, the sound of it being tripped will alert you of their presence.

If Hacker (booby traps equipment) and Ninja Pro (undetectable by Camera Spikes) are prevalent perks, I won't be using either of them.



Combat Training is a valid way to learn the maps and even once you have learned them, you can use it everyday to warm up. If it has difficulty settings, then I'm sure that the hardest one will be better than your average public match opponents, albeit predictable.