Man, there are a bunch that I haven’t been happy with. YMMY:
Rifles:
AK series rifles. They look so cool, but the ones I have fired have all been too small for me to shoot.
.338 Win Mag in a Browning A-Bolt. Brutal recoil impulse with this combo sent it down the road fast.
Browning Auto-22. I recently bought one after wanting one for decades. Now that I have it? I am so-so on it.
Shotguns:
Any SxS. The design punches me in the beak with every shot.
Revolvers:
The S&W 317. It is not an easy revolver to shoot well. The packability factor allllmost cancels that out, but it’s still not as cool as I thought it could be.
SRH in .454 Casull. Wicked fast, heavy recoil with full house loads are not fun.
S&W 642/442. (I have one of each) Ultralights are no fun to shoot. Even wadcutter target loads rap my middle finger knuckle with every shot. I keep them around, but shooting a box through one is No bueno.
Autos:
S&W 5906 Bad trigger, sharp edges, boat anchor heavy, mine jammed at a critical moment during a final qualifier so I had no faith in it ftom then on.
H&K USP 45. Mushy trigger, vague sights, just not worthy of the hype it received.
Walther PPK/s. Love the PPK/James Bond mystique. Sharp edges, snappy recoil, microscopic sights. Mine jammed with any JHP, then started doubling on me. Adios, sucka!
Glock 26. Just too stubby and plump to fit my hands well.
Stay safe.