I always preferred to look at kill/sortie over kill/death as kill/sortie better indicates how effective one is.
I don't mind 2 or 3 vs me, but when I'm already engaged with those 2 or 3 and then several more jump in (especially when they find out it's me - does anyone hunt zazen?)
Umm Shane...er Oopsy in AW...you yourself used to spend a great deal of your time at 30k trying in vain to hunt me...no doubt in a fruitless effort to douse that scorching case of noodle envy I inadvertently afflicted you with
I agree with YEAGER, kills/sortie is more reflective of the ammoload of your plane than anything else. It is also very distorted by whether you routinely (or never, in my case) re-arm. In my personal opinion, all four metrics (kills/time, Gunnery, kills/death and kills/sortie) need to be weighed in relatively equal proportion to get a "bead" on how "good" a MA flyer someone may be. Keep in mind being "good" in the MA isn't necessarily the same as being adept at any one thing in particular, it's the sum total of all of the attributes that make one successful in the chaotic MA environment; Gunnery, SA, flying skill, tactical judgement, etc.
It's far too easy to manipulate one or two of the metrics in isolation, but to keep all four up to a high degree of proficiency does require a broad spectrum of skill no matter what anyone tries to tell you to the contrary. For example, getting a high K/D is easy enough, fly ultra cautious, but then your kills/time will suck goat nutz, they are almost mutually exclusive, so it's a precarious balance.