One problem would be, that "good" players aren't playing on public servers. So they wouldn't get as much kills as the players, who play on pubs 24/7.
true, which is why this is a good idea:
... i personally think it should be done with kill/death ratio instead of total kills.
however, i dont think that should be the only ranking criteria. i think one's rank should be a composite of that, along with grabs and caps. hey, maybe even a grabs-to-caps ratio could fit in there somehow.
1 kill = 1 point
1 death = -1 point
1 grab= 2 points
1 cap = 3 points
the only problem with this is that ranking someone's skill on a fixed scale doesn't account for, say, the varying difficulty of maps. cuz sometimes, capping is much harder than grabbing, so on some maps, maybe caps should be worth more.
so i dunno the best solution for that.