I also doubt that ROTS will get any Oscar nods at all. That's just the nature of the beast and frankly there was nothing more or less remarkable in ROTS than any of the prequels before it.
As for 'Narnia', I liked the BBC series a lot and am looking forward to the film. To some degree I think the filmmakers have no choice in how the movie is sold and I agree they are trying to cash in on the LOTR success. If it gets butts in theatres than I suppose this is ok. I will see it but I hope they focus more on the story than on the trappings and scenery.