Personally, I love arcane: it's a faster spec, since the spells cast more quickly, and I feel more engaged.
Also, my mana matters, and I can turn extra mana into more DPS. Have a spare innervate? Give it to me and the raid DPS will increase!
All told, I'm having fun even with the nerfs.
This isn't my normal video style with detailed boss strategy explanations -- it's tuned more for people curious about how arcane works, why it works, and a place to learn the terminology so they can understand the intricacies of the spec.