Stormonu
Legend
Tiered feats are one way. Have Weapon Focus I, II, III, IV, and so on, so forth. Each one gives a different bonus which rewards someone for delving deeply into a single feat tree. Iron Heroes works like this, and it makes for some interesting character choices; do you dabble in a bit of everything, or specialize in one tree? Two fighters with different feat trees play quite differently.
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Unfortunately, it doesn't tend to work out that way - the character who doesn't specialize instead is "ineffective".
I'd rather that feats are only used to open up new options or trade options (such as Power Attack, trading accuracy for damage) not enhancing options already available to PCs. No Weapon Focus, Skill Focus or the half-dozen +2/+2 feats. Yes to things like Weapon Expertise (using Dex instead of Strength for Light Weapons), Whirlwind Attack (which turns your single target attack into a "burst" attack), Improved Grapple (no counterattack by foe when grappling), etc.