I’m a super casual player, I played original wow back in high school and a bit of burning crusaded but level 41 was probably my highest ever level.
I’m currently self hosting wotlk and a lot of people speak about that one as if everything after it got worse.
I’m just playing solo on my own server now and was interested to learn more about this.
I would say that mostly applies to the story. Warcraft 3 introduced the epic Arthas story line and wotlk is the conclusion to that. Nothing else they've done with wow on the story side has really compared to that. Though if you never played warcraft 3, this may not have as much impact on you. Oh and the story in some later expansions really stinks, such as shadowlands.
However, from the actual gameplay side, I would argue retail is infinitely superior now. Classes have mechanical depth and options. Max level content is much more varied with raids, mythic+, and delves. Warband features make the game so much more casual friendly, allowing you to hop around on alts.
If all you care about is the leveling experience and you don't want to really play much at max level, then classic and especially wotlk is kinda peak wow at that, but otherwise, retail is an improved game as a whole.
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