This isn't rocket science. Thorne and Clement sound 100% natural, as if they're at the game and calling the PBP. There's life and excitment in their delivery. The 2K announcers sound like two very bad voice actors who are sitting in a recording studio, pretending to be calling the game. There's no life or flow to their delivery. It's sounds 100% inorganic and completely lacking in authenticity.
On top of that, the script they were given varies from boring to stale to embarrasingly idiotic. Plus the in-game sound programming itself is staccato, choppy and clunky. Those issues I blame on the 2K people who wrote and programmed the sound script. But the fact they've had horrible announcing and the exact same issues for five years running now, tells me there's nobody on that development team who has either the awareness or talent to improve things.