Yeah, the 9x18mm Makarov cartridge should be compared to 380 auto; not to 9mm Parabellum (aka 9mm Luger ammo). The Parabellum or Luger cartridge uses a longer cased 9x19mm cartridge which can be loaded quite a bit hotter than the 9x18mm Mak can, because the pistols that shoot the 9x19mm cartridge aren't straight blowback designs like the Makarov pistol is and most of the older 380's are. (Some modern 380's are also of locked breech design).
I have a Kel-Tec P3AT in 380 ACP, and a 9x18mm E. German Makarov pistol too, so I've got one gun of each caliber in this fight. I think there's a place for both.
I think that the 380 auto cartridge is the ideal marriage of cartridge to gun in a P3AT or LCP or such gun that's intended as a BUG or police undercover gun, or for a situation where truly concealed carry is a must for civilians, or for any situation where the desire for a big hitter bullet must be counter-balanced by the need for absolute concealment of the gun. I think the use of any bigger caliber than 380 for this purpose would require a bigger, heavier, bulkier, an ultimately less concealable gun to shoot it in.
I see my 9x18 mm EG Makarov pistol and some of the brand x pistols that shoot the same 9x18 mm Makarov cartridge as being reasonably concealable for shoulder holster use under a sports jacket or suit coat when its not absolutely neccesary that NOONE realize you're carrying a weapon. This means it's ok for detective type police work or for taking my wife out to dinner in nice restaurants which for some reason nowadays all seem to like to locate in "edgy" neighborhoods, and to other places where I don't care if someone sees a little bulge under my jacket.
The big advantage of a Mak is it's legendary reliability. You know when you pull the trigger it's going to go BANG! every time. Except for the grips, its an steel gun and it's pretty heavy for a gun of its caliber. That may be a problem if you carry a lot and want a lighter weight gun, but it's a real blessing when you really need a gun because it can be held dead on a target when firing in single action. True, it doesn't hit as hard as a 9x19mm but it is more powerful than a 380, and if you can halfway shoot and handle a gun, it'll hit what you're shooting at just about as fast as you can pull the trigger without forcing you to reaquire your target after every shot.
IMHO, my all-steel EG Makarov is just too big and too heavy for front pocket concealment though. I tried it once and my wife hit me with that great old Mae West line: "Do you think I'm attractive, or is that a gun in your pocket?"
My EG Mak was originally used by the Stasi (E. German Secret Police) for undercover/detective/other secret police type work. It came complete with its shoulder holster when I purchased it. The gun was in absolutely beautiful condition but its holster was the cheapest-looking POS I ever saw. I dumped the holster immediately and bought new. But shoulder holster carry was and is this guns special niche, in my opinion.