NewPipe is a easy to use YouTube client that also supports other sources like SoundCloud oder FramaTube (both beta). It automatically blocks ads and has a built-in subscription feature, where you can also group channels e.g. to a catagory “LetsPlays”. You don’t need (and can’t use) a google account - so commenting and likes are not available.
I highly recommend using it, after I subscribed to some channels it became my daily YT client