It has been a few years for me, but OU always used to be a mess. I used to enjoy UU where the Regeneration abilities were at. Drawn out battles, a lot of buffing, swapping, predicting - but always with the chance to recover from an unlucky miss or critical hit. It had a great variety of strategies and some really exciting back and forth battles.    OU (back then) was just a 1HKO clown fiesta with whatever new mon had been granted the most powercreeped stats.