Yes you shouldn't. You should try to understand the physical constraints handphone makers face in terms of dimensions of the photosensors and even the lens, then perhaps you will realise that handphone photography is something bordering on an engineering feat.
If you are interested, you can read the following introduction article by Brian Klug of Anandtech. Introduction is a misnomer in this context. I often find that articles written by Anand and Brian to be of quality.
AnandTech | Understanding Camera Optics & Smartphone Camera Trends, A Presentation by Brian Klug
Well, although I don't understand all the technical jargon in the article, I already knew most of the things in the article.
If you are into photography for long enough, you can tell whether an image sensor and/or lens can make it or not, from a photography point of view.
3 major things affecting image quality :
1) camera lens
2) image sensor
3) conversion of the analogue signals captured by the image sensor into digital forms
The limitation of phone cameras is no excuse for poor image quality and I was not even commenting whether Xiaomi's camera is good/bad vs. other phone cameras nor whether the camera is good/bad for a S$169 phone.
I was basically just commenting the picture quality of the image from a photography imaging point of view.
Yes, I have seen much better image quality from many other phones before.
I mentioned I cannot be called a photographer because even someone who is not a photographer but with just some basic knowledge of photography, can easily see and tell that redmi's picture quality isn't very good from a image quality point of view because of noise level (which would be very apparent under low light shooting conditions).
If you cannot see it, then you are probably a complete photography noob.