I actually think people's views on the original are slightly warped because of its cult status. Sure back then when it came out it was original and you can admire Raimi's creativity at making the film on a shoe-string budget (apparently he invested himself hugely in the project, it was a real work of love), but on the face of it, it's not that good a film. The sequels are good because they embraced the silliness and over-the-topness that make them true classics. We had this conversation a while ago in this thread, but the first one had those characteristics unvoluntarily apparently, the bad acting and all the rest were just consequences of the little means they had at their disposal, but it was more of an accident than anything else.
But it does have a cult status and has influenced a lot of the genre since its release, that's undeniable. I don't think it makes its remake pointless at all though, it was a very decent film, well crafted (the cinematography in it was beautiful) and kept the spirit of the Evil Dead films. It was a bit of a fresh take and for amateurs of the genre I think it's a pretty enjoyable watch.
I missed the earlier conversation on this, must go back and have a look. Just to say that the cult status of the original has no bearing whatsoever on my own opinion of the remake as I saw the original when it first came out prior to it attaining cult status. I loved it and still do, it was a refreshing take on the horror genre at the time. Personally I don't see the point of remakes even if the remake is a decent effort which usually isn't the case but each to their own, to me its like painting by numbers.