Great start overall I think - set the stage for a lot of things that I'm sure will develop over the coming weeks, brilliant cars for the opening comparison, and the whole thing looked stunning in HD, never mind what 4k must look like.
The only thing that really didn't work was the whole celebrity section, which was dreadful and took-up way too much time. Hopefully that's the last we see of anything like that now that the opening episode is done.
I'll watch it again tomorrow, see what I make of it on a little more sleep