More surprisingly, there's a snip from Terry Pratchett dissing Tolkien. It appears in the Newsnotes section as a paragraph under the header 'Other Stuff':
on England's The South Bank Show,
shown on the USA cable channel Bravo, stated,
"At 17, if you don't think Lord of the Rings is
the greatest contribution to literature
there's something wrong with your head.
If you still think that at 50,
there's definitely something wrong with your head"
[SCIENCE FICTION CHRONICLE, ed. Andrew Porter, April 2002 issue, p. 24]
This quote is all the more unexpected, given that the late Sir Terry was well-know for being an unabashed admirer of JRRT's work (and also Tolkien's personal example of answering his fan mail).
I have to say I disagree with both halves of Pratchett's equation, but that's a discussion for another time.
I was an early adapter, having discovered the series thr my friend Richard West (thanks, Richard) when 'the series' consisted of just two books, and the most surprising thing about it was (a) how amazingly well he skewered the cliches of that era's fantasy and (b) that the first book had a sequel at all, given how thoroughly it seemed to have disposed of its main point-of-view character (by having his adventures on the flat world end with his falling over the edge). Pratchett tends to be one of those authors who people either like a lot, or don't like at all; not much middle ground. I like him a lot, and read through the first thirty books in the series pretty much as soon as I cd get ahold of each one -- and much else besides, including the underrated JOHNNY AND series and the overrated Pratchett/Gaiman collaboration GOOD OMENS. In fact, for a long time I'd read all of Pratchett except one early novel, DARK SIDE OF THE SUN, which I was saving because once I'd read it, there'd be nothing new left of his to read.
Over time, however, I found my attention drifting. The Discworld series had early on split into sub-series (Rincewind's adventures, the Witches, the Death books, the Night Guard) or even sub-sub-series (Tiffany Aching), et al. The books had always been uneven, with hits (THE LIGHT FANTASTIC, MORT, WYRD SISTERS, SMALL GODS, SOUL MUSIC, NIGHT WATCH) and misses (EQUAL RITES, SOURCERY, PYRAMIDS, WITCHES ABROAD, THE AMAZING MAURICE, THE WEE FREE MEN), but it seemed to me that the misses were piling up. It felt like the characters I liked best (e.g., Rincewind) were fading into the background and new series characters I wasn't much interested in (Moist Van Lipwig, Tiffany Aching) rising to dominate the series in their place.
So I took a break. Having, as I said, read all the books up to about MONSTROUS REGIMENT (2003), I've only read three of the last ten Discworld bks, and only one of the various recent non-series titles (NATION: his angry book). Now, having just read the final book in the series (and the fifth in the Wee Free sub-series), I'm in the mood for some Pratchett again, and plan to read some of the ones I missed (e.g. RAISING STEAM, UNSEEN ACADEMICALS, poss. I SHALL WEAR MIDNIGHT) as well as re-read a few old favorites. We'll see how it goes: whether Pratchett holds up in the way he doesn't seem to think Tolkien held up (still disagree w. him on that one) or whether a good book is a good book, whenever you read it.
just read: THE SHEPHERD'S CROWN, by Terry Pratchett 
currently reading: CELTIC HEATHDOM by Sir John Rhys , and STORIES FROM ANCIENT CANAAN, tr/ed Coogan & Smith [2nd ed., 2012]