Rather enjoyed Orions Hounds, although I wince every time I see the name star jellies(and I didn't like the crystalline direction mind-wise). Really brilliant eco system creation in that book.
Titan in Destiny was awful, I was actually hoping Ree would eat troi at one point just to spice it up. I stopped reading the series at that point as Hounds was the only one I'd actually frigging enjoyed, and even then that was far more due to the mission then the characters. Ree is the only one I really found interesting.