Yeah, Forge and Heart were great. It was like getting a new Spock's World every few years.
Vulcan's Soul was a bit of a slog. I ended up enjoying it once I finished the third book. But it felt like it would have been better if it had been one book instead of 3. I read the first book, but put it away for several years before finally coming back to it, rereading the first book, and completing the trilogy.
I liked the fact that they went back and tied in the Remans and explained them. They were something I thought was "weird" about Nemesis. But I really liked how that came about in the books.