BT-99 old model 34". Heavy, balance didn't work for my body, never could shoot it as well as I'd hoped at handicap distances. Sold it.
10/22. Blech. Unreliable feeding, picky about ammo, inaccurate. Sold it to avoid the common temptation to put $500 more into making it a satisfactory rifle.
Mosin carbines. Have 2. Don't like much, but will probably keep; not a lot of cash tied up in them
. Got a big muzzle brake from a friend; he said a friend of his machined a bunch and he found it in a drawer. Maybe with the brake, I'll like it better. Otherwise, they don't really do it for me like they do for others.
Milsurps in general. I bought a bunch, and I never shoot them. I like having them as curios, and they're cheap so I don't feel too prodigal about buying them, but I'm not all that excited about them as firearms.
Most everything else, I've liked and actually do shoot. Muzzleloaders, cap-n-ball revolvers, Mini-14, whatever.
I do have an old Mossberg rear tube feed .22 semiauto. It's really accurate, but doesn't always feed happily and the trigger is not great. But it's the first cartridge gun I ever owned (got it as a teen) and still in 99% condition, so I doubt I'll ever part with it, whether or not I shoot it.