Disappointed despite positive reviews

I had a Sony Vivaz U5, not a success, but such. tactile and "modern". For budget reasons, I was looking for a phone in the 70, even taking a non-tactile and 3M photo. I especially wanted a compact, lightweight, with good battery life. These three criteria are met, but I do not think by much against losing ergonomics: difficult access to various modes (silent, normal, ...), you can not lower the screen brightness, you can not assign a ringtone to a contact, you can not make some applications completely silent (buzzer remain active instead of sounds, not so discreet ...), no physical buttons to change the volume, ... This time, I find that this phone is not at all its 70, and I say that I should have taken less had I known to be so limited ...