Reading these comments with a wry smile - my first dog was a Patterdale and my God I adored her, and her me. I think we had a trauma bond. 🤣
It was 12 years of hell. Of course there are exceptions, SOME are sweet and gentle and SOME are reliable, but ours - and my MILs one before her, and another relatives one before that - were basically feral.
They are working terriers from working stock and aren't really made to be pets. Ours started off working and was manageable as long as she ran for 7 hours a day, but when she had an accident and couldn't work any longer she couldn't cope. She'd had puppy socialisation training but she loathed all other dogs from 10 weeks old.
She saw 5 trainers in her lifetime including a clinical vet behaviourist. We lived a complex life behind a carefully managed series of doors to ensure she did not escape and hurt someone or attack another dog, or bite anyone else (I got bitten and she got past me once and bit someone on the doorstep). Nobody could come in the house unless she was contained, and even people she knew were warned not to speak or make eye contact with her, and certainly not to try and touch her.
We eventually let her go when the pain from her old injury was no longer manageable, and she nearly got a chunk out of the vet even then. We cried for weeks and weeks, we loved her very much even though she caused nothing but problems in her little life.
We have a border terrier now - all the fun and loveability of a Patterdale with less of the drive and aggression. To get a reliable Patterdale with a good temperament you'd have to be very careful when you got the puppy - most are "backyard bred" from working stock and could have any number of undesirable traits. Not all though, granted!