Without engaging in spoilers - it's actually not!
It's hard to really do this without giving the game away but that 2-parter was, even with the destruction of the station, still one of the most optimistic epics I've seen. RBoE is not representative of what you'll find in these books despite it continuing the plotlines RBoE started.
Put it this way, a lesser story would have gone the opposite direction this duo go in and likely have gotten a 10-book series out of it. That doesn't happen.
The best non-spoiler way I can put it is that Plagues of Night / Raise the Dawn show the Federation finally recovering from the events of Destiny in decisive and positive fashion.