I have some catching up to do but personally, after book #2 it went to hell and apparently has just been going farther downI have had many issues with what has been done with Titan and things have just gotten sad. if it continues, it needs to find the magic it once had.
There have been some (very) good Titan novels as well. Orion's Hounds is a prime example of a very good Trek novel, and I personally loved Synthesis as well. Under A Torrent Sea is also a good read, although in my opinion not as good as Orion's Hounds, by the same author. Sword Of Damaclos was odd at times, but had a great concept and a very decent delivery at the end.