I've never been too much into adventure games- often times, the logic required baffled me (especially contrived items combination/use).
But I have a soft spot for Wadjet Eye Games, especially Resonance, and, more recently, Unavowed.
Gemini Rue, however, as far as I am concerned, is clearly inferior. Puzzles are alright : they won't stick in your memory, but they aren't too far-fetched either and don't impede your progression.
Dialogs are solid and characters, globally, enjoyable. The problem, in my eyes, is rather to be found in the story, or, more precisely, what its strenght hinges on : its plot twist.
I had my fair share of plot twists, in books, movies, series and video games, and this is maybe because, contrary to many others, I find this one close to being terrible.
Two main reasons for this. First, if you have a bit of flair, I genuinely think it's predictable. For me, just looking at the cover of the game was already a hint, confirmed quite early in the game. Si I had zero surprise.
The other reason : when the Bid Bad explains his scheme, I had a hard time believing it. I won't spoil of course, bit it didn't make the plot twist worthwile.
At the end of the day, it's still a decent adventure experience- but I would recommend other Wadjet Eye Games, really.