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.
“There is no such thing as a weird human being. It’s just that some people require more understanding than others.” - Tom Robbins