Bleeding Critical: Whenever you score a critical hit with a slashing or piercing weapon, your opponent takes 2d6 points of bleed damage (see Conditions) each round on his turn, in addition to the damage dealt by the critical hit. Bleed damage can be stopped by a DC 15 Heal skill check or through any magical healing. The effects of this feat stack.
Greater Overrun: You receive a +2 bonus on checks made to overrun a foe. This bonus stacks with the bonus granted by Improved Overrun. Whenever you overrun opponents, they provoke attacks of opportunity if they are knocked prone by your overrun.
Overrun: If your maneuver is successful, you move through the target's space. If your attack exceeds your opponent's CMD by 5 or more, you move through the target's space and the target is knocked prone.
Prone: The character is lying on the ground. A prone attacker has a –4 penalty on melee attack rolls and cannot use a ranged weapon (except for a crossbow). A prone defender gains a +4 bonus to Armor Class against ranged attacks, but takes a –4 penalty to AC against melee attacks.
Standing up is a move-equivalent action that provokes an attack of opportunity.
For a 11th + Fighter, is Bleeding Critical worth the feat to do an extra 6 damage on average per round when scoring a crit? I guess it is good if you face multiple foes and attack new targets for bleeds on multiple targets.
Using Greater Overrun you have to exceed your opponent's CMD by 5 or more to knock them prone. They provoke attacks of opportunity if they are knocked prone by your overrun. Then you and anyone around them get instant AoOs? And then another AoO when they have to use a movement to get up from anyone threatening them? That seems really good if you have multiple party members threatening that overrun foe.
For a 11th + Fighter, is Bleeding Critical worth the feat
This may be better answered in the Advice section of the forums.
Using Greater Overrun you have to exceed your opponent's CMD by 5 or more to knock them prone. They provoke attacks of opportunity if they are knocked prone by your overrun. Then you and anyone around them get instant AoOs? And then another AoO when they have to use a movement to get up from anyone threatening them?
Correct, barring any other circumstances or oddities.
When your greater overrun knocks them prone, they provoke. This happens before they fall, so they don't (yet) take the -4 penalty to AC from being prone. Anyone who threatens the enemy can take this AoO.
Any time a prone creature stands up, they provoke an AoO from anyone who threatens them. They suffer the -4 penalty to AC when this happens, as they have not yet stood up from prone when the attack happens.
-edit-
They do have the opportunity of staying prone. Sometimes the penalty to attack is worth the penalty to AC (and not provoking again and being set up to get knocked over again next round).