Just tried checking damage given really quick by headshots on a player and panzering a player. I got their HP in damage with smg, and at most 400 damage from the panzer! Heavy weapons do significantly more, hadn't realized this, thought it would only do their HP bar in damage, and panzers rarely miss too. Mortars probably do the same thing and you receive hardly any damage (not saying that it doesn't take skill to use a mortar). Perhaps the headshot ratio bonus needs strengthened? Still wondering what to do about glitch weapon accuracies too; there should be a 100% acc cap of course, but it still messes up the rating bad, and I'm wondering if some weapons should even be counted at all? I'll download that rate calculator when I have the time to try it.

@Paul, if you factor in maptime after calculating the rate, it means you are applying map length to all formula values, including ones that shouldn't, such as headshot ratio and accuracy. If those values diminish by a factor of your playtime, you are essentially making it so playing longer makes you do worse. That isn't good. If the system can't handle applying session length to only certain values, then it would make frag rating extremely difficult to calculate accurately.