Personally mine is 3.94. Yeah, screw me. Im a killwhore. I only play Killconfirmed and TDM though. My scale personally is....
Less than 1.5- Deadweight, will probably go even/negative
1.5-1.75- Decent objective player that can get kills also
1.8-1.9 Either REALLY good obj players or bad killwhores.
2.0+ Decent killwhore or godlike/lucky obj player
2.5+ Great killwhore
3.0+ Veteran killwhore
3.5+ master killwhore