MR absolutely is a measure of skill. The skill of researching where to find mats, to farm and to build stuff is in my regard also one of the facettes of warframe. So MR is absolutely real, it just not represents what OP would like it to represent. I am at LM 3 and it took me years to get there. As a above 40 years old, my reflexes and hand eye coordination are not what they used to be. I have a few hours a week where i can play, so i'm quite proud of this achievement and unwilling to let it be cheapened.