EMUI is like other operating systems - you either love it or you hate it. I personally loved it - it was customizable and smooth. I've read other users here that liked it as well - I guess it just depends on who you ask.
And you're right - reviewers are biased (like everyone is); and so I take reviewers and their videos with a grain of salt. When it comes to their opinions and some of their comments about things like OS's, I prefer to wait to see what my own take is before I make a decision one way or the other.