Eternal Darkness is one of those gems that isn't necessarily executed to its full potential, but there are so many fantastic ideas in there, that I will always have this in my collection. A remaster that brings some of the mechanics a little more up to date would be a day one for me.
I usually do a run every couple of years, I enjoyed the combat when it came out, much more so than Resident Evil, but it hasn't aged well. As for the Sanity effects, they are still brilliant, even if the underlying mechanic is a little too easy to circumvent (even on hardest run). I sometimes let my character go a little insane just to see what the game throws my way .