Benny 3: Unbound - Has been one of my favourite releases all year. I can't remember a single thing about it that I disliked
Dorian 5 - To my embarrassment, I haven't listened to this one yet. I really like this range though, so I'm looking forward to hearing once I get to it.
Gallifrey: Enemy Lines - THRILLED to finally get another Gallifrey title! I was a bit disappointed that it was so quick to throw out the Intervention Earth story and cliffhanger, but the story itself was so thrilling and entertaining that it's hard to stay mad at it. Bring on Gallifrey 9!
Jago & Litefoot - Quite enjoyed both box sets this year. The Doctor felt a bit shoehorned in in Series 11, but I don't feel that it detracted from the whole. And I adore Ellie, so I was thrilled that Lisa Bowerman had so much (acting) to do for Series 12.
Survivors - Not sure whether to count this as a "Worlds of Big Finish" title, but since we're here anyway... Series 4 left me a bit cool - the first episode was pretty lousy, but Series 5 was excellent.
Torchwood - The monthly/series releases have consistently been interesting (at their worst), and damned good at their best. I'm still a bit undecided on how much I liked Torchwood Archive, but holy dang Outbreak was fabulous.
UNIT - If I'm being honest, Shutdown put me off a bit. I found a lot of characters very 'play by the numbers,' while the Tengobushi voicing was done in such a way that it was awkwardly close to a racist Asian stereotype. I don't want to call out any one person in particular on this, but it made me a bit uncomfortable listening to that. - I'm not done with Silenced yet, but I've been very happy with what I've heard so far.
Vienna 3 - I have bought, but not yet listened to.