All of these are regarded as among the best and/or most popular things in anime history. So why we look down on Keijo if it has all of these elements and executes them extremely well?
Oh right, the asses. But this is not exactly a parameter to badmouth something, especially when it's exactly a parody sports-esque anime, with a super exciting plot, great soundtrack and breathtaking battles that own nothing to anyone.
The animation is great, the ascension story to master a technique, the exciting battles, it's everything a regular shounen anime should have and they're executing it flawlessly.
The ecchi is a little over the top, but why bother if everything else is so great?
Don't be a prude, embrace a good booty and give Keijo a shot!
