Pretty Hate Machine is about the only good NIN album. Trent Reznor takes himself way too seriously, and it shows on everything he made after PHM. The Fragile bored me to tears, literally repeating the same song so many times with slight differences. Makes even Funker Vogt's Survivor sound good...
Edit: Oh, despite not liking anything else NIN put out, I really like Pretty Hate Machine. Easily one of my favorite albums. It sounds like what it is, late 80's EBM, but is quite good nonetheless.