I will turn this around slightly since I have actually owned very good pistols, all reliable believe it or not.
Got rid of and shouldnt:
My first glock 19 back in 1996 (sold it to a friend, corrected mistake)
2 S&W J-Frames one model 60 and a 642 (currently correcting this mistake)
Got rid of and happy about it (simplification is awesome):
Sig 239 (too big for 8 shots)
Sig 225 (too big for 8 shots this one was hard to sell but couldnt justify keeping it)
Ruger SP101 (too heavy for 5 shots)
HK P7 PSP (reliable until it breaks)
S&W 686 (what was I thinking!)
Kimber Custom Compact (actually 100% reliable for me but it was an old one)
Kel Tec 9mm (trigger sucked but very reliable)
Kel Tec 32 ACP (not comfortable with caliber, but very reliable)
Walther P22 (reliable but not similar enough to carry guns for good training)
Only unreliable pistol:
Uberti 45 Long Colt (fun but once you stop reloading not worth it)
NOW: Glocks, a Kahr PM9, and soon to add back the Jframe I shouldnt have sold.