I'm amazed at the flexibility of the 3.X fighter. One of my favorite characters was a fighter who was built upon Dex, Wis, and Int instead of Str and Con. He was a blast to play and a sound build in regards to power level (he did mix in levels of Monk though

)
It is one of my growing complaints about 4E - build straight jackets. If you are playing a fighter, making Int or Dex your highest stat is just foolish. The game (as it is now) just doesn't support a non-Str fighter.
Look at just the base 3E book
- Str Fighter had the Power Attack Feat line
- Int Fighter had the Combat Expertise line
- Dex Fighter had the Dodge Feat line
- Two Weapon Fighting feat line
- Ranged Fighter feat line
- Toughness Fighter feats (Toughness, Die Hard, etc)
- Weapon Master Feat Line
I miss this flexibility