I don't understand why you could be upset over this.
It isn't like the Nets splurged and signed every superstar to the same roster to bull-doze the league.
They felt pressure after what they perceived to be an underperforming season and splurged to make their team a little better. Honestly, all this spending has only bumped them from "guaranteed second round exit" to "fringe contender if they are healthy and everything else goes well, but they will probably still not get out of the east".
There really are no grounds for complaint, here. Brooklyn is going to be the 4-5 seed and gut out one or two nice play-off series before they lose out to the Bulls, Pacers, or Heat.