I have to say that I find it quite disturbing, frustrating & annoying that Apple has dropped iPhoto & Aperture and replaced them with an app that, in my opinion, is inferior to both. I really find this assumption that Cloud is what it's all about & is relevant to all users very annoying.
I rely on iPhoto for my work. I have well over 40k images & iPhoto allows me to keep them easily sorted & tagged.
None of that is there in Photos.
As one previous poster said Photos is about as useful for cataloguing as a shoebox full of photos.
What I also find very annoying is the forcible installation of Photos and the subsequent updating of your library every time you update the OS.
I have been halting the update process & manually removing Photos with every update & have had a couple of heated conversations with Apple support over this.
In my book it should be asking permission before updating your library & making an app an integral part of the OS is no excuse.
Anyhews... I'll be updating to El Capitan soon so will have to go through that removal process again but thanks for the heads-up that some peeps have been having iPhoto issues, I have bookmarked this thread for troubleshooting support 🙂