Some horror stories here. The 2 I owned that disappointed me were a 700 Remington in .223. It was horrible by 1900 standards, but it wouldn't group for me. I gave it away. Second would be a Ruger No 1, that I spent some money on, and it still wouldn't satisfy me. While I bedded the 700 and it still wouldn't shoot, there's not much you can do to the No 1...fore end work. Tried that too, no joy.
I've been pretty lucky, I guess, or not as demanding as some people. Mini 14s? My Sheriff's Office where I worked bought them as patrol rifles back in 1999 or so. The rifle had the reputation for being inaccurate and I didn't expect much, but they were patrol rifles, not sniper rifles. We trained on them at 75 yards, all we could get at our range, and they surprised me. Even new rifle shooters had no problems hitting all rounds in the sweet spot on a sillhoutte at that range. Which is good enough for a patrol rifle and new shooters.
When my agency switched to ARs, the sheriff offered to sell them (the Minis) to deputies at the price we paid for them back than and I bought one for $300. It ain't no varmint rifle, for sure.