I re-read the entire series on Sunday. I really don't think the back half was quite as bad as I'd thought it was during the single read. The shift of artist was a little disappointing but the artist they got in for the last few issues, Stephen Thompson(?), was pretty good and his style looks somewhat similar to Tristan's. I do think he's another one we've been spoilt with though and I really hope he comes back on more projects.
Storywise, the back end of the season does get sloppy. There's really no time for the hugger to finish the business with Hollis, the whole thing with letting the Queen out and then her mysteriously dying despite "not even a scratch" following her fight with the mercs and then they just sort of turn around for home. Granted, I get why and I liked those last few issues of wrap-up but just felt a little bit of a whimper rather than a bang.
I really did love all the characters. It was definitely a great core group. I'd be really interested in seeing a continuation.