I have seen several people saying that this is the first IF work that they've played, or it is the one that got them hooked.
I count myself amongst them.
I think I downloaded it from Download.com way back around '99~2000, back then there's few free game that is worth playing and when World's Apart came up with high ratings I gave it a chance despite never played an IF in my whole life.
It took me a bit to get to know the commands, but like a good book the world and its inhabitants pulled me in, and I would call the atmosphere of the game "tranquil yet mystic".
I have played many more games from then on, but World's Apart still stood on its own on the strength of the unique world, style and very effective atmosphere/mood.
I thought about giving it a 4, since there's still areas that can be improved, but compared with other IF it stands strong on its own despite its flaws, and extra points for being the first IF I read. 5 it is.