I love your post Mckenzy. Just to add my own personal feelings to the mix: We all have very different ideas and needs on what photograpy should be, such as, family, art and commercial photos but I feel we on FM are almost to the point of a mental condition, in that we over scrutinize a product to the point of unreal expectations and forget about, can this product do the job. Honestly I think 99% of lenses out on the market (cheap and expensive) can do a respectable job. I do know the amount of money spent on a given lens doesn't mean you'll get great results in your over all skills. I feel Mckenzy was correct in saying, in my interprutation, that there is no lens that can take over the experience of the photographer.
So what if this "X" lens is 2 pixels sharper than the "Y" lens. In the final output ones work is graded pretty much on composition and creativity. Your only as good as your creativity and the mastery of your equipment. If your starting out there is absolutely no point in getting "L" glass. Actually, when you become skilled there might still be no point in getting "L"glass. One of my favorite lenses is my Tamron 24-78 cheapo.
The worst people who blame their glass or other glass are the hobbyists. They try to hide their lack of skill with sharpness.