If you intend to watch content in 360p the ad may be 480p. Either way you have to wait for the ad to finish before the video would begin to buffer. And one in 5 ads didn't forward to the video because of some bug, so you have to refresh the page, watch the ad again.
On fast connections youtube often doesn't switch quality to 720p fast enough, so if you switch it yourself it will often stall. Then you have to refresh the page, watch an ad, then see updated quality.
On fast connections youtube often doesn't switch quality to 720p fast enough, so if you switch it yourself it will often stall. Then you have to refresh the page, watch an ad, then see updated quality.
YouTube center fixes this.