I've read all of the TNG Relaunch to date, and here are my thoughts:
Death in Winter - Not the absolute best Star Trek novel ever, but I thought it was of acceptable quality. Most of it happens off-ship while the Enterprise is still in drydock after Nemesis. It mainly features Picard and Beverly, with cameos from two of MJF's Stargazer characters. Overall a fast, easy read and acceptably entertaining.
Resistance - Not horrible, but not that great either. Mediocre is how I would describe it. The Borg are back, but not written very cleverly. The final solution comes off a little lame. We learn about three new crewmembers, only to have two of them killed off, dropping us nearly back to square one. Read it to get the overall background to the books that follow, but don't expect much.
Q&A - I'll join the consensus in identifying this book as the diamond in the rough. It's a fast and entertaining read featuring Q and giving some background tying in each of Q's appearances in the show and some previous novels. It introduces us to two new characters that may actually stick around, plus adding to the characterization of the new counselor from the last book. This one, of any of them, is definitely worth your time.
Before Dishonor - This is uncategorically the worst Star Trek novel I've ever read (out of almost ninety). The Borg are back again, but have "evolved" in a way that's almost ludicrous. There are far too many cutesy jokes and references for my taste (the Pluto jokes, the historical references to Paul Revere and Neville Chamberlain, the gift shop joke), and the Borg ship flies through the heart of a star, but is somehow still vulnerable to the planet killer's anti-proton beam (wtf?). But the worst parts by far are 1) the new personalities that were thoughtfully sculpted in Q&A undergo a complete character destruction at David's hands, betraying Picard, Worf, Beverly, Geordi, & Spock, yet somehow quickly forgiven and allowed to remain on the ship and 2) Although billed as a TNG novel, it heavily features two Voyager characters (including having one as the only person on the cover). Not that big a deal, except that one of the characters undergoes an irrevocable life change. Again, not an unforgivable sin, but because it happens in a novel so badly written and sub-standard, it left me with a very bitter sense of extreme disappointment. I'm not normally a proponent of "reset buttons", but if there was ever a place I'd like to roll the clock back and overwrite something, this is it.
^All that being said, though, I think that the best is yet to come. It's important with a multi-author series not to pre-judge the work of one person harshly by the failings of another. Christopher L. Bennett and David Mack have written excellent novels in the past, and I'm looking forward to seeing how they resurrect what was once a promising (and eagerly anticipated by me) series.