Long story... because I can't tell a short story:
It would seem that the ratings were intially high in the first season, but started to dip. Paramount didn't like this, and when the season ended they made a decision: rather than, say, let the show go another year and hope for improvement, or even do the merificul thing and simply cancel it, they demonstrated their typical suit mentality and thought that the best solution was to bring someone new to run the series. The new producer was Frank Mancuso Jr, who just happens to be the son of a Paramount bigwig.
But they didn't just put him in. They replaced virtually everyone behind-the-scenes. It was mainly the removal of the creative triumvirate of Herbert Wright, Greg Strangis, and Tom Lazarus that was the deepest hole, but I figure they only carried about a quarter of people from the one season to the next, even getting new soundtrack composers. So not only were the people who launched and built the first season gone, but Mancuso had no shame in casually admitting that he didn't watch the first season. I seriously doubt any of the new people did, either.
So a long story short: new people replace old people. New people don't know squat about previous season. No one bothers to consult anyone or refer to anything about previous season. New ideas boldly conflict with old story. Fanbase is alienated. Ratings sink. Show is put down like a wounded horse.