The vast majority of my pistols have functioned without issue. Many of them haven't been fired all that much, however. I'm going to ignore every pistol that hasn't malfunctioned but that hasn't seen at least 1,000 rounds, and I'm not counting the rounds with faulty primers that didn't ignite at all or that ignited on a second strike against the pistol.
Beretta 92FS -- 37,700 rounds (of all kinds of ammo), no malfunctions
Wilson Combat Beretta 92G Brigadier Tactical -- 1,250 rounds, no malfunctions
Beretta 84BB -- 1,100 rounds, no malfunctions
SIG P49 (P210-2) -- 4,650 rounds, no malfunctions
SIG Sauer P229 -- 7,450 rounds, no malfunction
Browning Hi-Power -- 6,375 rounds, no malfunctions
Walther PPS -- 2,900 rounds, no malfunctions
Four of my pistols have experienced malfunctions (and other assorted problems, in one case) to varying degrees. From least to most problematic:
Colt Gold Cup National Match -- 2,800 rounds, 1 failure to eject (round felt weak)
Glock 17 (Gen 4) -- 800 rounds, 4 failures to eject (all early and with first version of RSA using weak FMJ ammo; no problems later even with original RSA)
HK USP Elite (.45) -- 400 rounds, 19 failures to feed, 3 failures to eject (using both FMJ and JHP ammo; need to send it in for warranty work)
Kahr P380 -- 850 rounds, every problem under the sun (as detailed
here)