One word: Quidditch.
Not only is the wizarding world strange enough to have only developed one sport, but the single sport that they have also made ZERO sense.
The scoring system. Score a goal - 10pts. Catch the snitch - 150pts and the game is ended. This is ludicrously unbalanced. 90% of the time the chasers are utterly irrelevant to the outcome of the game. Forget that nonsense going on down below and get me 7 seekers on my team, let's go get that little yellow bitch.
The crowd. What exactly are they watching? The only thing that matters, catching the snitch, can happen within the stands or a hundred yards out of the stadium! So while I’m watching 6 guys throwing around a quaffle in a finely balanced 40–30, suddenly there's an announcement: “Hey… sorry you couldn't see it… but Potter got the snitch and the game’s finished. Gryffindor wins. Have a safe journey home.”
*THE CROWD CAN’T SEE THIS*
Harry is Gryffindor’s seeker at the age of 11. If I was a fully grown man of 18 and didn't make the team in my senior year because of a child I'd be pissed. Luckily that would never happen because 11-year-olds have only just started flying lessons and that would be ridiculous. Oh, wait.
Draco becomes a seeker at 12. Seriously, is Hogwarts that bad at producing seekers?!
Bludgers. “Sorry Mrs. McWitchface but your son has, unfortunately, died during Hufflepuff v Ravenclaw because a 150lb Bludger struck him in the face.” But then Hogwarts never was one for health and safety.
Muggle-borns at Hogwarts must've been like “wtf is this nonsense, let's go watch some football”.
Update 1: Let’s talk about the Quidditch world cup match between Ireland and Bulgaria.
Ireland wins 170–160 but Krum catches the snitch. What on earth is a professional sportsman, in a World Cup final, doing knowingly losing his team the game?! Imagine a Super Bowl with the Patriots down by 4 with 10 seconds left, it's 4th and goal. What Krum just did was kick the field goal.
The comments saying this game proves chasers are relevant to miss the point - the Ireland chasers shouldn't have won the game and only did because Quidditch’s biggest star is an utter moron.