It has nowhere near the "stopping power" of a .45, in fact it fails to even meat minimum penetration in gel tests, it's a decent target pistol, but not a defensive one. Ballisticaly it's on par with a .22 magnum.
To say the 5.7 is "ballisticaly on par with a .22 mag" is dead wrong. Ever heard of Fort Hood?
stolen from wiki
At approximately 1:34 pm local time, Hasan entered his workplace, the Soldier Readiness Processing Center, where personnel receive routine medical treatment immediately prior to and on return from deployment. He was armed with the FN Five-seven pistol, which he had fitted with two Lasermax laser sights: one red, and one green.[13][14] A Smith & Wesson .357 Magnum revolver (an older model) was later found on Hasan's person, but it was not used to shoot any of the victims.[9][15]
According to eyewitnesses, Hasan had taken a seat at an empty table and bowed his head for several seconds when he suddenly stood up, shouted "Allahu Akbar!"[16][17] and opened fire.[18] Witnesses said Hasan initially "sprayed bullets at soldiers in a fanlike motion" before taking aim at individual soldiers.[19] Eyewitness Sgt. Michael Davis said: "The rate of fire was pretty much constant shooting. When I initially heard it it sounded like an M16."[20]
A shooting victim being transported to a waiting ambulance
Army reserve Captain John Gaffaney attempted to stop Hasan by charging him, but was mortally wounded before he could reach him.[21] Civilian physician assistant Michael Cahill also tried to charge Hasan with a chair, but was shot and killed.[22] Army reserve Specialist Logan Burnette tried to stop Hasan by throwing a folding table at him, but he was shot in the left hip, fell down, and crawled to a nearby cubicle.[23]
According to testimony from witnesses, Hasan passed up several opportunities to shoot civilians, and instead focused on soldiers in uniform.[24] At one point, Hasan reportedly approached a group of five civilians hiding under a desk.[25] He looked at them, swept the dot of his pistol's laser sight over one of the men's faces, and then turned away without firing.[25]
Base civilian police Sergeant Kimberly Munley, who had rushed to the scene in her patrol car, encountered Hasan in the area outside the Soldier Readiness Processing Center.[26] Hasan fired at Munley, who exchanged shots with him using her 9mm M9 pistol. Munley's hand was hit by shrapnel when one of Hasan's bullets struck a nearby rain gutter, and then two bullets struck Munley: the first bullet hit her thigh, and the second hit her knee.[14][24] As she began to fall from the first bullet, the second bullet struck her femur, shattering it and knocking her to the ground.[14][24] Hasan then walked up to Munley and kicked her pistol out of reach.[27]
As the shooting continued outside, nurses and medics entered the building, secured the doors with a belt and rushed to help the wounded.[28] According to the responding nurses, the blood loss inside the building was so heavy they were unable to maintain balance, and had difficulty reaching the wounded to help them.[29] In the area outside the building, Hasan continued to shoot at fleeing soldiers, and civilian police Sergeant Mark Todd arrived and shouted commands at Hasan to surrender.[24] Todd said: "Then he turned and fired a couple of rounds at me. I didn't hear him say a word, he just turned and fired."[30] The two exchanged shots, and Hasan was felled by five shots from Todd,[3][31] who then kicked his pistol out of his hand and placed him in handcuffs as he fell unconscious.[32]
An investigator later testified that 146 spent shell casings were recovered inside the building.[27] Another 68 casings were collected outside, for a total of 214 rounds fired by the attacker and responding police officers.[27][33] A medic who treated Hasan said his pockets were full of pistol magazines.[34] When the shooting ended, he was still carrying 177 rounds of unfired ammunition in his pockets, contained in both 20- and 30-round magazines.[27] The incident, which lasted about 10 minutes,[35] resulted in 30 people wounded, and 13 killed—12 soldiers and one civilian; 11 died at the scene, and two died later in a hospital.[36][37]