Things like it wouldn't read my sim (bug 666), the stylus was almost required, but there was no place to put it, audio issues, sleep/wake issues, poor battery indication and tricky to charge from a flat battery.
Sure, the screen was kind of small, but the resolution was high, so you could claim hidpi before Apple invented it?
I say like the idea of as opposed to use as currently Fairphone is out of my budget and I can't find a phone in my budget range that's supported by Lineage/MicroG so I just have somewhat reliable <£100 phone with as much de-googling as I can while still having normal android.. (Not much)
Edit: the bonus of phones in this price range is like Fairphones they almost always make it easy to quickly remove the battery so you're certain nothing's running.
Then an enterprising startup can deliver marked-up, preassembled devices, then people might have privacy again.