I only have 2 games with Titania and one of them was during the beta, but from my experience, I mostly share @melkore's point of view.
Walgeist are too slow, and I don't bring them unless there are huge parts of severe terrain like forests or ponds on the board. The knights are just way better for +1SS.
I had the same experience with the Rougarou, both times it got gunned down before it could do anything.
Bultungin would be good if only they had some defensive abilities, but are really too squishy.
I tried killjoy, but wasn't keen on how it works.
So, I'm left with:
Titania, seems like a good master.
Aeslin, circumpstancial, can be good, can be bad
Groar, doesn't do much until it replaces something else.
The knights, good tarpits, but they won't score you any points.
And that's a bit short to make a decent team. No beaters, no scheme runners, you have to look for them OOK or in versatile.
I'm not experienced in M3E and might have missed some important interactions in the team, but to me it got a feeling of: I play Titania and some random OOK/versatile dudes instead of Titania and her crew.