Good to hear. Decided to play a little more today and finished the first act.
While I liked the first 2 chapters, the next 2 chapters were even better. Loved them and the graphics really begin to shine once you get to the hotel.
Nevertheless I got two more little glitches. While loading the third chapter I could already hear the cutscene audio but the loading screen was still visible for about 5-10 seconds. Then after a battle the sound of heavy breathing (caused by running) wouldn't go away even when standing still. It fixed itself after a cutscene.
So far the campaign is far superior to anything in Gears 4.