No it's not strange to see the same teams in the playoffs. It's always cyclical when they're in dominance. Look at all the periods for the NFl and you'll usually see the same team in the playoffs for several years on a row until the key players retire or are traded and the rebuilding process begins again.
And NASCAR? *shudder* I'd rather watch paint dry.
"We choose the right to be who we are. We know the difference between the reality of freedom and the illusion of freedom."