The first time someone watches Sportscenter, it's easy to understand why it's so popular. The way it covered sports was much more exciting and interesting than the way someone at your local news or at CNN would cover sports.
Now, with Pardon the Interruption, I feel the exact same way. There's no better way to get a quick summary of the previous days sports news. Not only is it quicker than Sportscenter (only a half hour compared to an hour or an hour and a half), but it's actually very funny and doesn't waste a bunch of time on pointless features (50 States in 50 Days anyone?) and gets right to the point of every issue.
Anyone who watches will quickly get all the sports info they need, and be entertained. Most of this is thanks to Tony Kornheiser and Michael Wilbon. Not only are these guys funny, but they know their sports and are both able to get their point across quickly.
Part of the reason PTI is so entertaining is its extra, original segments. Like over/under, Mail Call etc. These segments always add a bit extra to whatever it is they are covering and help to make PTI as great as it is.
The only real downside to PTI is "Five Good Minutes", where Tony and Mike interview someone. Once in a while a PTI interview will actually be something cool or with a person that no one else has interviewed yet, but for the most part it's kind of boring and makes me wish they'd go back to talking about sports issues.
The old saying is "Less is more". Tony and Mike keep it short, but end up being more entertaining, much more funny, and much more informative than any other sports show out there.