Quote Originally Posted by Kurald Galain View Post
The main problem with skill focus is that it trades you a rare resource (a feat slot) for a common one (a bunch of skill points, essentially).

Having it make a class skill makes it worth taking in certain specialized builds. How high a bonus it gives really isn't that important.
A 6th level rogue using "Improve Feint" might disagree with the "common resource" point of vue. Yes, you got plenty of skill points as a rogue...but you still can't have more ranks in a skill than your level+3. So, instead of 9 in Bluff, our rogue here can get 12, which increase by 33% his chances to get a sneak attack in a duel.

Skill Focus, at low level, is the way to better at something than you should be. Fighters more than anybody can enjoy it. Now, it makes no sence to take it if you know the campaign will bring you 20+ level. But at low-level games, a little +1 in a good thing... and a +3 is a big thing.