I suppose it depends on the fact that special effects have become a lot better.
The Thing remake had incredible effects for the time and made the film, if it had have been a remake of the original it would have blown it away.
In the case of War of the Worlds - again, the effects were great but as a movie it wasn't fit to clean the boots of the original.
The Haunting - the original scared the life out of me but that pile of Hollywood detritus that 'Everyfilm' Nielson was in was pure pap.
I don't know, I guess I'm biased - if you look at garbage like Pink Panther and Fun with Dick and Jane, I came out of the cinema feeling my humour had been raped and I felt unclean. It's left me with a morbid fear of remakes.
I would have to say that I haven't yet seen a good remake and I guess that these days I'm reluctant to spend good cash trying them out.
The Fly? yeah okay it's a lot better than the original but then Goldbloom has fly genes - he seems to play a fly in everything he does.