The Abu Dhabi airport is relatively interesting, but certainly not enough to do for 10 hours. I would suggest leaving. It's about a half-hour drive to Abu Dhabi, with taxis easy and cheap. You could kill some time walking around downtown Abu Dhabi. Check out the Emirates Palace hotel, which is near the Marina Mall.

It's also about a 75-minute drive from the airport to Dubai, so you could easily get there and back and see plenty in your layover period.