I'm very thorough and spent a good 270 hours on my first run of the game. I didn't finish. I was max level for over 100 hours.
I am impressed. I have no clue how you squeezed that many hours out of it. I thought I was taking it real slow when I finished the game in about 120h. In completionist runthrough I reached a cap deep into act 3, so it seemed well balanced to me. That said with how XP is calculated I can imagine people easily gaming the system. For that reason I prefer PoE1&2 XP system (quests for completing quests, exploration and limited kills per enemy only).
