I've moved quite a bit so seen a load of different ones and at my current practice they have a lot of locums.
I got to see the new not locum Dr the other week though after 5/10 minutes of him looking things up on GP notebook and not really helping much at all he just said he could refer me to a specialist (only wanted to try going back on the pill to see if it helped with women's problems) before he saw I was a lawyer on my notes and was there for another 20 mins or so with him asking legal advice.
I saw a locum years ago after feeling what I thought was a lump in my breast. He didn't seem to understand, said I was too young for breast cancer, asked me if I had a "leaflet" (?). He finally said he supposed he should examine me and just sat looking at me. I just stared back at him as I was sat in front on a window with builders outside so he got up and swished the curtain across with a big huff, barely touched me and muttered something about my cycle. I was at a firend's after and her mum was there and was horrified and made me book another appointment.
The doctor I saw then was lovely, incredibly apologetic, especially as it turned out he hadn't even noted I'd been in, let alone what for. She found two lumps. They weren't sinister but that's not the point.
I think it depends on the Dr.