When you see it that way, it's not that complicated. Maybe it would help if the website had better info on what CDF is. Or perhaps I should just switch to the "luck" numbers that some pools use. "Luck" isn't exactly defined anywhere, but I guess 110% luck means we found 110% of the blocks we'd be expected to find with the current difficulty and amount of work done.
I'm scared to use the "L" with a lot of people not really understanding what random really means but I really like the idea. Currently I use the amount of green versus red in the Latest Blocks section of the Live stats page as my happiness indicator.
I too think CDF is an opaque number to new users but, I think most experienced miners can grasp the concept. I do think that Fahlcor's idea of a stat where 100% being the expected work and 200% being twice the expected work, etc... might be a nice newbie-friendly stat. I also really like the idea of an “Expected Block Frequency” stat that is based on the current hash rate.
Ultimately, from reading all of the suggestions that the Doc is getting, I think there are two camps. The experienced folks who want good hard details. e.g. the kind that are difficult for hobbyists to grasp. And then there are hobbyists that can't or don't care to understand the conceptual details that make up a lot of the current and proposed stats. This leads me to believe that an "Advanced View" and a "Basic View" might be the only way to give everyone what they want and to minimize confusion. I think this forum thread could be broken out into two threads (one for each) where people could ask questions relevant to them and get answers delivered in their terms and at their level of comprehension. This is kind of the case now but if the 2 views are implemented I would suggest making the purpose for each a little more defined.