The "Chinese" branded phones are getting pretty good - I have a OnePlus 2 and it works brilliantly and cost a fraction of what a Samsung of a similar spec would have cost. Of course the downside is that if it goes wrong, you are going to have a "fun" time with customer support!
That said, there is a huge difference between lesser known Chinese brands such as OnePlus/Xiaomi/Oppo who sell their own designs and the companies making fake branded phones (e.g. fake iPhones/Samsung phones) - The former are generally pretty good devices for the price, the latter are still bad, low quality and often illegal due to trademark infringement.