The new rule changes are interesting. When cars had to refuel, it was known pretty much what lap they were coming in. With tires only, it's much more flexible - track conditions and driving styles change things around, and teams have to react to unexpected tactical opportunities.
The other interesting sight was how the faster cars started on the faster, softer tires, but the slower teams started on the more durable ones, meaning that come the end of the race, the slower teams were actually as fast as the big teams.
I'm a bit worried by the lack of overtaking in the second half of the race though. I hope the regs don't turn the end of races into a procession.