On a side note about lag and commando.
Yes lag takes a part in it, but also game coding is a factor as well. Neither of you I don't find to be wrong. But when you have a good connection, there are plenty of times you should be down and you aren't, thanks to lag. But it's important to note that lag is a 2 way street. You share the same advantage and disadvantage the person who is lagging bad. It's hard for them to hit you, but it's hard for you to hit them because they teleporting across the screen.
But game coding is definately an issue too. I've got a few people in the "lunge" but not many and I have been taken out in the lunge. But the majority of the time, thanks to my redneck internet, I usually lose the battle from both sides. When all connections are equal, I usually win thanks to commando's teleport abilities.
Lightweight is a 7% increase, so it's even less then the 10% you want.
The grenade launcher should replace perk 1, which is even worse the the knifers. But, back on topic. I agree with Marathon and Lightwiehgt in the same tier. If it's not knifers, its rushers already in your spawn after 2 seconds.
I do use Marathon and Lightweight quite often, but it's stupid seeing everyone run around like Usain Bolt.
How is it not? You have to get "close" (you know what I mean, lol) to them in order to knife them.
With the OMA Grenade Launcher tactic you can just sit back and wait for people to pass by, surrounded by Danger close claymores. Then refill.
And don't say that you have to be far.