I updated my iPhone Xr to iOS17 (I think it was a point release) about a month ago because I got an Apple Watch and wanted to be on the latest version for that. I was on 13(?) before - did not like 17 at first and got used to it. I did not notice any appreciable difference in battery life- I was mostly annoyed by the changes to Safari and photos.
Then last week I updated to iOS 17.1.2 - the latest version. My husband had gotten a new phone and once he moved to it, we have had issues with Find My. We can both see our kids, but he could not see my device or me in People. We both updated to 17.1.2 (he was on an earlier version of 17, but not the same as mine) We tried to reset Location Share again and then I couldn't see him. We tried again and now I can see him (in People list) and his device with the location and he can see me listed twice in his People list but both say "Location can't be found". wtf
Anyway, the first few days of 17.1.2 I had a huge battery drain - I thought maybe I'd left my hotspot on- but no. I ended up rebooting my phone and I think it's under control now. Lasy night, I had my phone at 100% at bedtime and with no activity from midnight to 6 am, it went from 100% to 95%. Then after having my screen on for a full hour and a half over the next couple of hours, it went to low 80's. This was using Microsoft Teams (for work). So not too bad, I guess.
As far as apps, I've noticed weirdness. I mostly use Safari, Teams, Messages, and then things like Photos, Find My, Snapchat, Facebook, The Weather Channel, My Verizon, various restaurant/shopping apps. Most of the non-apple apps have had weird blank screens, lagging, funky behavior. Even Safari has been flukey. I'm a tech geek (work in IT) so I go by the old "reboot if it's not working, unless you think you have a virus", so I rebooted and I'm still assessing whether that weird behavior is gone now.