WP is a nightmare to use at night.
Screen rotation kicks in ( I understand rotation lock is coming but things can take some while at Microsoft), have to adjust my myself to the phone, not the other way round. I can't watch videos because the light from those 3 buttons shine like a sun into my eyes, it is possible to turn them off but that also turns off active syncing of your device. It might not sound like a big deal but it's nuances like these that diminish the whole user experience. I can go on to list the shortcomings (and strengths) of WP but it has already been thoroughly discussed here and I am not even talking about the apps. To be honest, until Microsoft packs all these basic features into this OS, which I hope will happen soon, WP remains a sub par experience.