Neither are Staal or Girardi, but you defend them to the death.
Anyway, I don't think Karlsson is very good at defending in his own end either, but hes actually pretty good defending against the rush and he has the wheels to keep up with anyone. The fact that he doesn't spend all that much time defending when hes on the ice is a major plus, since he able to maximize his strengths and has less chance of having his weaknesses exposed.
I'd take Keith over Karlsson too (not for us, I'd much rather have the RHD) but you do realize that there is an almost 40 point gap between Karlsson and both of those guys this year right?
Thats a HUGE difference. The difference between Doughty/Keith to Karlsson is basically Keith Yandle's production this year.
This is a discussion about how Karlsson compares to some of the best offensive defenseman to play the game, and you are bringing up Staal and Girardi, as if they relate at all to this discussion.
You can use the "Karlsson has the puck a lot" excuse to excuse his defense, but its really not a very good argument. His team doesn't have the puck 95% of the time when he's on the ice, that type of percentage just doesn't exist in a competitive hockey league. I don't even know what his possession percentages are, but I do know that the best players are pretty much only around 60%, so even 60/40 requires the ability to play well without the puck since 40% without the puck is still a substantial number. This isn't the Canadian National Team against the Indian National Team, the NHL is a competitive league from shift to shift and game to game, all players have to have some ability to do everything because of the amount of parity.
About the points, if all three players points are averaged over an 82 game season, Keith is 25 less and Doughty is 28 less, but if there was some way to quantify defensive ability, Keith and Doughty would be substantially higher than Karlsson, so although those numbers might work in Karlsson's favor, its a very one sided argument since we don't really have an agreeable way to quantify defensive ability like we do offensive ability with points or assists or goals.