Improved Knockdown is also a godsend to them.
Good fighters have a strategy to them. It's simple, but very important.
You are either a STR-based tank,
or you are a balanced jack of trades with a few aces.
You have to know how to defend before you attack.
AC, saves, and attack bonus are the highest priorities.
And always make sure you have a weapon suited to your surroundings.
If you are getting whipped on, pull out a shield and a one handed weapon.
If you are confident, use a two-hander.
Always keep a bow, crossbow or sling handy.