as times goes by more and more people complains about the "fixes" to some skills of their profession, this topic isn't about complaining or suggesting a fix, because mostly these suggestions are going to be about the "easy" way and the "anet" way... so, no complains, just suggest, and please if a mod can block the devs from accesing this topic it would be appreciated

(j/k)
i'll start
Expertise
The easy way: it only affects ranger skills, 3% per rank
The anet way: For each rank of Expertise, the Energy cost of all of your skills are decreased by 4%. In order to achieve this you must strike once per rank. (so to achieve a 40% you must strike 10 foes first)
keep going