Just binged the first 8 eps, at least on a par with the pre-S6 seasons, definitely better than 7&8. Didn't take off for me until about halfway through ep3 but since then I've been loving it.
Niggles: poor London geography, although they did a great job of reusing the bottom of Regent Street & Waterloo place, not to mention what looks like part of Southwark. Good examples of bad geography:
US Embassy is a very distinctive building in Grosvenor Square, yet the show makes it look like its on Pall Mall.
The helicopter flight to Wembley was laughable - Jack flew from Central London, back to the East & in again just to get a Tower Bridge shot in.
Caitlyn Stark's daughter gets hit by the bus at Waterloo place, it then switches to Admiralty arch, and she was chasing the kid out of what looked like a Notting Hill terrace - which there are none of anywhere near Trafalger Square.
Still it's better than this travesty from Lost: