Sports Night was a comedy, so when the characters did stupid things it somewhat fit in because they had a lot on their mind. Donna was an idiot at times but it made sense and she still did her job really well... most of the time. It worked better, it was only 22 minutes.
However the second season was very very odd, people started fighting just to shake the show up. It wasn't horrible because events happened and everyone was fighting the network for their jobs, but it was handled a lot better than The Newsroom. I suggest watching it. Plus when the characters screwed up they owned to it and were dealt with.