has anybody beat pokemon black and/or white yet. and was it good or do you perfor another pokemon game.

I "Beat" black (the game continues after the credits). and I had fun. I don't have previous experience with pokemon though, so I can't really compare.

Beat it and proceeded to never play it again.
The game was same-old same-old. I liked the new Pokemon, it has nice music, and it finally used animated battle sprites despite being a decade late. The new mechanics really weren't interesting or used well at all, but it's a solid game. Enjoyed it FAR more than Generation IV.
Fire Red ad Leaf Green are still the best in the series.

YouTube - Michael Jackson - Black Or White Here is your answer.