I listened to it again today so I can contribute to this thread. With the sole exception of Lars' drum, I like it. I like it a lot. I like it more now than I did when it first came out.
I actually think that the production has a lot to do with it. If the album was "properly" produced and James sang properly, I think the songs would be as boring as bat shit. The way they are, the production lends the songs a sense of urgency and anger and that's what the album is. It's more of an angry album rather than a metal album. I think if it was a band other than Metallica everyone would love it and call it a masterpiece (except for the drums).