I can't stand the Arctic Monkeys, to me it's ashame no one takes note of their slogan and "don't believe the hype". If you like them then that's great, they aren't my cup of tea and they are no different from what most bands produce these days. "I bet you look good on the dancefloor" is a great song to dance to when you're drunk, but apart from that they have little bearing on my life and their lyrics are meaningless to me.
As for Oasis, they had two good albums (Definitely Maybe) and (What's the story) and then basically decided to bed their heads into their arses and started producing horrid music. The Masterplan wasn't bad but Oasis have simply lacked creativity and bite since Wonderwall.