I feel Ebert and Roeper are of the school that has kept fantasy films out of Oscar's graces. They don't want to approach fantasy as an art in the first place. The two artists who won for the production design have many illustrated books published of LOTR. I disagree that there aren't films that may be depressing but are great films and "Mystic River" would not have been nominated if it weren't a great film. However, the handwriting was on the wall as LOTR was an achievement unique in the industry and the art in the sets, the costumes, the makeup and the ensemble acting is all there. CGI doesn't create itself -- someone has to creat in the computer and it begins with drawings and concepts. I've been a bit wary of Ebert of late -- I think he's handing out far too many three and four star ratings. Earlier interviews, BTW, revealed that Ebert and Roeper were resigned to the fact that LOTR was going to win. Roeper even seemed a bit sheepish about it as he gave the first film thumbs down (and given some really mediocre movies thumbs up). Critics are good guides to what films to catch but I prefer to read many reviews.
If you go to
www.mrqe.com and enter "The Return of the King" or any other parts of the trilogy and you'll find over 90% of the critical reviews are favorable and many of those are rave reviews.