I've been giving it a few 25th anniversary spins, and I gotta say: I don't think I can say it isn't the best NIN record anymore.
I will always LOVE Broken, as it was what got me into this band. The Fragile is fucking amazing.

But, good GOD, TDS is utterly mind blowing, still. All of my favorite bands are insanely original: Tricky, Rasputina, Boards of Canada.
And TDS is utterly fucking singular in that way. Also, because of this, it's timeless. I don't think it would sound dated, at all, were it released today.

Also, what @Shadaloo said a few posts back.

I can't write some eloquent thing about what the album means to me that's better than that. Good show, man.