Where the previous game didn't follow the show's storyline and felt more like a side-story or alternate tale, it had a somewhat unique visual style and feel. It was a top-down 3D action/adventure title that, while somewhat repetitive, stood out. The Burning Earth, on the other hand, just feels like another generic 3D action license game. There isn't anything particularly wrong with the graphics (besides a lack of any attempt to lip synch the voiceovers), it just feels bland and doesn't help the game to stand out.
Audiowise, I'm in the same boat. The game's music is straight from the show and does its job, but so is the voicework. All of the lines said in the game are the exact same sound clips seen on TV. What this means is that the game offers no real lift and you are just playing through the same exact script of the show. I found this made the game feel a bit more bland because I've always enjoyed playing the game version of something and getting a little extra out of the storyline. This makes it feel like there wasn't a whole lot of effort put into The Burning Earth.