I like skrillex,and the arrangement is excelent. It's actually so good (the arrangement) that makes the song a lot better than it actually is...
Skrillex is not a great song writer, in my opinion. Doesn't have good melodies, and chord progressions are not very original or anything. He's a good producer, his sound world is his best feature.
Deadmau5 is a lot more original, i think.