I'd say the least respected are:
Dance, Applied Buisness, Law, Anthropology, Archaeology, Citizenship, Communication and Culture, General Studies, Health and Social Care, Leisure Studies, Travel and Tourism, ICT, Media, PE.
Probably a few more too, but that's the ones my college offer from the top of my head. Its hard to say what subject is easy because personally, I'd fail Dance miserably yet I'm quite good at Chemistry. Easiness is subjective. I'm going to get negged because there's going to be people who study these subjects, but they aren't very respected and that's hard to disagree with. Basically anything on the blacklists, Oxbridge isn't everything but its a decent guide.