Ok, I counted them:
Bersa 2
HK 3
Hi Point 4
Raven 4
CZ 5
Tanfoglio 5
Kahr 6
Glock 7
Sig 10
Llama 11
Para 11
Jennings 12
Taurus 12
Springfield 13
AMT 14
Colt 14
S&W 15
Beretta 17
Keltec 17
Ruger 17
Walther 22
Kimber 25
I have excluded in this list any manufacturer mentioned only once. I did not include posts that only included the name of the manufacturer and a pejorative. Ex: keltek yuk
. I tried to separate posts with experience from simple bashing. I might have miscounted a few, but the trend is there. Even if I over- or under-counted 2 Kimber posts, Kimber still has the highest number of complaints. I skipped a few manufacturers that are out of the mainstream (Daewoo, High Standard, etc).
A few things stand out:
Good luck finding a reliable .22 pistol. Many of the Walther, Beretta, and Sig posts referred to .22.
Variants of the 1911 make up more posts than any other design. See Colt, Kimber, Para, and Springfield. Yes, I'm sure that it is due to tinkering with JMB's design. Don't shoot the messenger.
I couldn't find a source that lists quantity sales by manufacturer. That would be helpful in determining likelihood that a particular design would fail. You could compare sales numbers to failure numbers. However, one example where you could safely guess would be Ruger vs. Keltec. I imagine that over the years Ruger has sold many multiples of the amount that Keltec has sold. Since there were the same number of complaints, you could surmise that Rugers are several times more reliable than Keltecs. Another point that could be made is that Glocks have become so ubiquitous in the last couple of decades that finding them among the least complained about guns on a major gun board speaks volumes for their true reliability.
Just saying. Draw your own conclusions.
In the interest of disclosure, I own a Ruger and a Keltec only. Yes, the Ruger is more reliable.