The first season was quite good with Baba Voss as the main character. Once the focus went to the queen, Baba's kids, etc. the second season felt flat and uninspired.
The season finale was slightly better but its clear that the only reason why the series is somewhat ok is because of Momoa's on-screen charisma. Without this the whole thing falls flat on its face.
I won't be subscribing to Apple TV just to watch season 3 for sure.