With three of them working on an enemy, they can Demolize just about anyone from shaken, to frightened, to panicked where he's cowing if he can't escape (like he's surround by three dudes and not allowed to take actions like Overrun cuz he's panicked). Its a perfect kill if you have a forth guy to stab your enemy in the face with a sharp stick.
Sure you have to make three checks a round(opposed vs a d20 + HD+Wis bonus), but you expected a perfect kill without a little work?
SRD wrote:Panicked: A panicked creature must drop anything it holds and flee at top speed from the source of its fear, as well as any other dangers it encounters, along a random path. It can’t take any other actions. In addition, the creature takes a –2 penalty on all saving throws, skill checks, and ability checks. If cornered, a panicked creature cowers and does not attack, typically using the total defense action in combat. A panicked creature can use special abilities, including spells, to flee; indeed, the creature must use such means if they are the only way to escape.
Cowering: The character is frozen in fear and can take no actions. A cowering character takes a –2 penalty to Armor Class and loses her Dexterity bonus (if any).