When you judge based off of logs, you see a very narrow snippet of the possibilities.

For instance, if you judged the assassinate skill based on the QHCF log board, you might very well think that it WAS slay. No one posts logs of the 2000 times a Target logged off in their guild or cabal after 20 stalks. Because people only post and only remember the remarkable, not the mundane.

But if you play a character and use the skill constantly, you can see the trends and realize when it works and when it doesn't.