There is nothing wrong with 9mm at all IMHO. I have this conversation a lot as my issued sidearm is 9mm. I am actually cleaning mine at my desk as we speak.

It all depends on shot placement. I personally can shoot a .45 better than the 9mm so I like to stick to what I shoot best(for the guns I own at least) but a 9mm is easier for most people to shoot as there is very little recoil. A steady aim and a double tap from a 9mm will drop someone just as fast as any other handgun if your aim is true.(assuming he is not wearing plates) People often get in heated debates about stopping power but how many have any real world experience to back it up? personally I would not like to be shot in a vital zone by any calibre, but given the choice I would rather take a .40 to the leg than a 9mm to the chest.

If you can become highly proficient and accurate with ANY reasonable calibre, then you are a deadly force to recon with.

Beware the man with only one gun........