My girlfriend watched the series as it aired on TV, but she also wanted to watch the DVDs with me. I agreed with at the first season, and it was actually pretty good. It's almost like a soap opera meets a traditional drama show, and while season 2 wasn't as good as the first one I didn't mind watching through it.
The show is mostly the same since season 1, except the obvious continuation of the character's plot-lines.
There are some new characters like Felix and his sister Anna. I didn't like Felix's character, but I liked Anna's.
And some loser named Chris Keller trying to ruin Nathan and Haley's marriage by taking advantage of her through his connection to the music industry.
And Dan Scott initially seems to be changed, but then goes out and finds a way to be the world's worst father and overall person again.