As a desktop SKU, i'm indifferent. The overclocking could be better, but it is still the best part to purchase for a new desktop - this isn't really a compelling option for those who already have IB and were considering yearly upgrades.
As a mobile SKU, however, Haswell is going to be VERY exciting. I can't wait to see what products PC makers come up with, they're finally competing with Apple on quality (and will FINALLY have higher screen resolutions) and not just on price. Additionally, this opens up the door for a lot of Haswell based tablets and form factors that just weren't suited to intel products prior to Haswell. In this respect, Haswell will be a game-changer IMO.
The desktop part isn't extremely exciting, and the desktop user in me is somewhat disappointed. Overall, it was expected though - intel stated from the outset that mobility/efficiency was the goal. And here we are, no surprises.