But hey, speaking of tiered perks, I do kind of miss the old pro challenges. Kind of. Some of them were downright terrible. MW2 sitrep, I'm lookin at you. Would be kind of cool if you could pick 1 perk to run pro once you'd unlock it or something to that effect.
In simplicity, utility. Through utility, simplicity.
To the posters above, I run VSAT, Dogs and Swarm constantly. A lot teams do quit, but when they don't it's glorious. I don't really do it for the kills though, it's not like I really worked for the additional 20+ that come from the streaks -- trying to get my dogs and swarm each game is just a fun challenge, whether the enemy team quits or not.