My problem with this is that it doesn't seem to account for the most important factor in attack effectiveness: Base Power.
To account for base power in the formula might make people think that brick break is a better option than ice punch in certain cases, simply because Close Combat would have brought the PATE of fighting moves way down (Head Smash would do the same for rock). Something like hyper beam would throw the whole thing off, since it is learned by most pokes and has huge Base Power--not to mention the fact that it's near impossible to numerically account for the recharge, or for recoil, or the effects of Outrage, etc.
X-Act can correct me if I'm wrong, but I believe that the chart was meant to be used in combination with the formula to determine a certain move's effectiveness on a certain pokemon, or to help determine which pokemon to use over another based on its moveset/STAB's.
The way it is currently set up--with the chart AND the formula--is a lot more useful in terms of application to more moves and application to more pokemon (and it was a significant amount less work, I'm sure).
For example, say you're trying to decide between Night Slash and Brick Break for your Max-Attack Sandslash (an unlikely scenario to be sure, but it's just an example). For night slash, compute (378*70)/82175=32.2%. For Brick Break: (378*75)/75295=37.7%. And voila, brick break is a statistically superior choice. (since both are physical moves the attack value is irrelevant; I just wanted to get a meaningful percent. But keep in mind the attack values would be different if a physical move is compared to a special one.)
I'm not saying that the chart and formula are infallible; Staraptor's Close Combat is rated below Double-Edge, which is obviously not the best choice. But with a bit of common sense, the chart can be useful for generating new testing ideas, picking filler moves, deciding which attack to use if much of an opponents team is unknown, &c; and besides all that it's a great referential resource.
This is pretty awesome work. --TAY
EDIT: As it turns out, X-Act beat my post by 3 minutes. Oh well.