I never say much (or anything at all) on these topics but here's my take.
For me, the current system is fine - really ok. Sure, it reflects the time spent in game which is naturally unequal between us somehow. Not only is that life but it also reflects effort (time) input and, to an extent, ability. I side with Zup that in theory there is nothing stopping a level 20 player advancing rapidly to the top with ability (much faster than me with my limited skills).
Clearly, there are those with other claims such as kdr who would prefer a leaderboard that would vault them to the top, and those are ligitimate requests, but do we change the baseline everytime somenody else has a different claim to fame? (I destroyed more tanks etc. etc.).
Aside from some kind of historical re-basing (I used to be a MORAF like many others) I'm ok the way things are, though I can say (because I do it in excel pulling the ranking once per month) is that a regular (weekly/monthly/whatever) activity indicator would be interesting but only as a "nice to have" and not critical. I do it in excel to see each players activity (kills, deaths etc.) and it gives me an idea (without points) if I'm likely slipping backwards or moving up.
We need to be cautious, that if we eliminate the current system, we will only come to grieve its loss later.
And ultimately, isn't is all about just having a good game? Somehow it would also be preferable if the 34/18 drubbing I got from Frits today wasn't recorded (although the points harvest was impressive
)