There are two ways to look at this as the Cavs.
1. It is no big deal, early in the season, some players are out, etc. I mean the Warriors got crushed by the Lakers early in the season last year, how'd that work out for both teams.
2. This game clearly shows the holes/flaws the Cavs have and is indicative of the struggle they will have all year long and even into the playoffs.
It is probably something between the two extremes and the Nets are obviously an improved team (as I have been predicting all off season).