I can't think of an MMO that is themepark that has even a sliver of a fraction of content in EQ2.
Tons of raids
Collectibles (gotta get those shinies!)
The best housing of any themepark MMO (with the exception that Ultima Online is better, but it isn't themepark)
An amazing crafting system with a TON to craft, and one focused entirely on housing
Tons of replayability with all the classes/races
Lots of expansions that add tons of content, even a new one with ascended classes
Tons of lore to find
Huge world to explore, bigger than almost any other themepark
And that is not even most of the features. Just the ones off the top of my head.
The only downside is PvP sucks, no content for that. So it gets negative marks here, because PvP content is EXTREMELY limited and not balanced. EQ2 is a PVE focused game through and through. That is a good thing though. There was a developer that said (I think it was for age of conan) that they wished they either focused ONLY on pvp, or ONLY on PVE...because focusing on both makes no one happy and everyone unhappy.
Free to play is kinda lame too, very limited. They turned it back into a pay to play game really, and everyone on the EQ2 forums agrees that they realized they made more money (not lost it when they focused on free to play) as pay to play, with an OPTIONAL cash shop (no different than WoW's cash shop).
While EQ2 may not have aged well graphics wise, there is still no MMO today with a fraction of content and things to do in EQ2 as far as themeparks go.
My Skyrim, Fallout 4, Starbound and WoW + other game mods at MODDB: