There are some melodic death metal albums that will outlast the rest, and interestingly enough, they are all from the early period when it was a lot more genuine.
Eucharist - Velvet Creation
Dark Tranquility - The Gallery
In Flames - Lunar Strain, Subterranean EP, Jester Race, Black Ash Inheritance
It's not I listen to these that often, but I know I could if I wanted. And yes, I realize I left out Slaughter of the Soul. I never yearn for that album at all, I'd much rather listen to Slayer or something. I've never given enough time to "The Red in the Sky is Ours", probably to Erik's dismay.
Not sure where Dissection fits in, but SotLB is equally as good as early In Flames IMO. I know everyone will say it's better through disdain of modern In Flames, but I think they're about on par when you think about it.
If Lunar Strain got a proper production (where each track was at least at equal voume), then I'd like to give that a listen with some fresh ears. It could be the best melodic death metal album ever!