I've been wondering this as of late as I always hear people in real life and on forums bashing the 9mm,and they bash it hard to. They'll say things like "i wouldn't shoot can with a 9mm" or "you better get a hi cap mag,if your lucky he'll go down by the 15th round" its just amazes me all the hate that abounds for this round.
I've never been in the service but I have friends/family who have been and still are,two of the them Navy seals and they have told me that they use Sig 226 9mm's and they have both said a 9mm will work fine for SD,that what one carries as his own personal weapon on his CCW. To me this says a lot in the sense that these people have actually shot people with a 9mm handgun with ball ammo no less,and they say it where you put the bullet. All this being said with the modern JHP's we have no like the Speer GDHP and golden sabers and others I feel a 9mm in perfectly fine for SD use.
A friend of mine also told me that a lot of the 9mm failure to stop stories you hear are just retold by those who have heard this from others.,and that it was a combination of primitive JHP design 20+ years ago with poor shot placement. As my friend says "all handguns are underpowered just pick what you shoot the best,practice and you'll be fine". So who here feels the same as I do that the 9mm is a good SD round?