To all the people who say he does not need a rework, I can only say this. Have you played olaf and seen his winrate on champion.gg? I mean obviously, you should not base your arguments jsut off of winrates, but they do support a point. It shows that for the majority of the playerbase, the champion is losing them the game 53% of the tme. That is enough for me to consider it being detrimental to the champion. I main olaf jungle for a long tim, and I am mastery level six with him, but recently in the last year or so, I struggle to find wins anymore, in comparison to a year ago. Olaf's main problem is that all new champions have way more mobility than him, and kite him easily. The whole point why you play olaf is to dive the backline. However with all the meta champs like tristana with her jump and twitch, who can go invisible as soon as olaf ults and wait out the ult duration, olaf cannot fullfill his role anymore. Additionally, if you play him jungle, his clear is ok, but what sucks is ganking. Camille, can use her insame mobility to just juke your axes, the same with champions like yasuo. Either you buff him, where you increase the movespeed gained on the ult, to allow to reach the backline easier, or buff his tank stats, so he can survive long enough to catch up with the carries he is supposed to kill. Right now I run comet on olaf, as you get a guaranteed hit with every axe. I play him as a poke machine in teamfights, as this is the only way I can meaningful contribute to a teamfight, because no matter if you build fulltank, you do no damage even from the ad boost of your ult, and if you build damage, you are not tanky enough to reach the backline. Do you see where the problem is now? The main issue is that, while champions like trynd and mundo need a rework, they can still fulfill their function, even if they are not as flashy/interesting while doing it. Olaf, whose intended playstyle was dive the backline is now played like a poke champion with max cooldown just throwing axes. When people play a champion differently to what he was intended for, and not even this way having much success judging from the winrate top & jungle, thats when you know champs need a rework, not if they look old but can still hold their own. Additionally, he is rarely played in the LCS, because now he is only picked situationally, using it to combo a galio ultimate for instance. He is rarely played for a reason, and if he is played, one needs to ask why and not just say he is played and thats why he is fine. Sorry for you having to read all of that XD. Have a nice day.
Yours Sincerely, an Olaf main.