Glad they are fixing bugs, but there are major problems on my end:
(1) Airplay is even more buggy than before...hasn't been the same since iOS 7 honestly.
(2) iCloud Photo Library - don't know how this was omitted.
(3) Remote App - we all know...especially as an extra controller...should be connected via Bluetooth this time around.
(4) Chapter Markers - most of my ripped content does not display chapter markers...very annoying...plus there is no way to just skip ahead chapter markers either I don't think.
(5) Crashes - I have had the Apple TV crash many times already.
There is much to like about the new Apple TV, but for a 4th generation product it is a disappointment...really feels like a 1.0 release. This feels like when Apple redid iWork (which still has major deficiencies when compared to the previous version despite some of the newer benefits).