I love 8 TBH. Took a while to get used to but if you know your way around your new keyboard shortcuts... things can be much faster than 7. I stick to Desktop mode with the exception of Kindle and a few Metro games I've purchased.
On a side note, Metro is a completely useless interface on a desktop which is rumored to be fixed in the upcoming service pack... a revisited start button. That's (AFAIK) confirmed for Server 2012 R2, but we'll see what consumer Windows brings.
On a tablet though.... love the metro interface. Picked up a Lenovo Yoga (seriously freakin amazing laptop/tablet) and I've really grown to like the Metro for ~mobile device usage.