I don't mind the ad recommendations on home and after a video, but having to watch an extended ad or 2 before a video, and continuosly throughout the video, is enough for me to get off YouTube as an entertainment platform.
Still useful for tutorials, but that much advertising makes the experience completely unenjoyable. Doubly so if the ad has to be "skipped" or else will run for 3 minutes, and I'm in the middle of something with hands occupied (cooking, working out...)