So would you guys say this one redeems Titan after the last two books?
I would say we can treat the previous Titan book like it never happened.
With the mention of Titan charting the "Gum Nebula" in the story, I think the author was probably also trying to forget the other two books as well.
Martin's book weren't universally bad. Remember, they did a great job of fleshing out the Gorn Hegemony (keeping The Gorn Crisis
in continuity). The Hranrarii were cool and unsual (because of being amphibious) aliens of the week. The Vela Pulsar was fascinating "space porn". Torvig's relationship with White-Blue was continued.
And don't forget we got a cool Andorian starship and the old transporter-duplication was brought back (still needing resolution). Especially Seize the Fire
was a thriller, with its Gorn vs Gorn action and the evolving encounters between Titan
and the Gorn flotilla.