Lots of people see Power Playing in complete antithesis with Role Playing.
They're wrong.
While some powerful combos can be horrible in a roleplaying perspective, this isn't a rule.
People forget to mention that focusing just on the "roleplaying idea" we have of a character and not to the rules needed to give flesh to that idea, usually ends up in character unable to fill their role, also in a roleplaying way...
If my beloved scout inspired by the skillful Robin Hood lacks good talents and a good strategy, he will not be able to be the character I wanted him to be. If the arrows he shoot are nothing compared to the strikes of the party's barbarian, it will be difficult mock such a barbarian for is lack of grace and stealthy maneuvers.
It can seem a paradox, but, actually, if you're able to build stronger characters, you're also able to take some "flavour" skills or feats that better reflect your character's background without lowering too much your usefulness to the party...
One great rule in life is to know when you have enough of something.
If you feel comfortable with the proficiency of your character in doing what he should do (be it destroying enemies, save everyone with some magic or decipher strange runes in a god-forgotten dungeon), you'll be able to add more roleplaying details, even renouncing to things that would have made you more powerful.
This website is for people who actually roleplay, and want powerful characters because they want to roleplay powerful heroes (or villains), without discovering in the middle of a game session that their characters can't actually do what they wanted from them.
Kreaton