The app itself does not suck but as everybody can post videos there this results in a lot of rubbish. And I agree about the comments about the mentioned new experts showing off. But the app is great and useful once you figure out how to correctly use it and let the algorithm show you what you really like.
There is something for everyone to find, for example cooking recipes, athletes and actors, science, history, entertainment, basically everything. You should register once and mark your fields of interest. Once you start to give likes and follows the algorithm will bring you lot of similar videos and you will be mostly shown only items you like. And important, if a video sucks, do not watch it through, otherwise the algorithm noted your interest. I even started to date a pretty girl who found my attention (no, I will not give you the link to her videos 😄).