I can't really see Oddworld being worth buying, as amazing as the game is. I don't want to fork out £20 just for a higher resolution version
It's been done! Unfortunately though, not the first Silent Hill
Silent Hill 2 got new voices as well, which IMO is better than the original. But you have the choice between old and new voices.
And as far as I've heard, the remakes were badly made.
It wasn't
really bad. It is just a HD conversion after all. If you enjoy achievement/trophy hunting then it's worth having, otherwise might as well just torrent the PC version if you're not interested in that.