I've watched PLENTY of full series on YouTube. However I don't watch so much mainstream. You can still catch the latest English Premier League or Champions Lea

I've watched PLENTY of full series on YouTube. However I don't watch so much mainstream. You can still catch the latest English Premier League or Champions League action if you get there quick enough (in before the lock). IIRC all of the Naruto (Anime) subs used to be up there and they were licensed to Viz Media. They're much better at removing the stuff then they used to be but say three or so years ago YouTube was stuffed with full episodes. I remember watching almost all of "Everybody Hates Chris" on YouTube.