Earlier Youtube use to be most informative site where anyone with internet connection can watch videos related to the needed subjected.
But now from the day youtube allowed to put ads by using adsense account ( part of google only) you can see people started loading videos like hell. To check this, just go to trending videos section of you tube, you surely will see 90% of the videos shown are all craps and just developed for the sake of getting ads posted to make earnings.
The videos with best informations are not promoted. There is no sensor or reviews for the videos posted, anyone can post any video on youtube and it will remain there till no one has objection on it.
Youtube is best to watch on 4G connections, rest all networks will give a waiting experience.
Informative videos now a days have to be searched with great efforts. Totally depends on what you looking for.
Unusual or videos out of subject will be always shown in the trending list which will irritate anyone.
Youtube app is bit confused as while watching a video you cab go to your tube channels but will not easily can reach your watch later list.
Its horrible on slow speed internet only best to watch on 4G connections.