A few older melodic death classics:
In Flames' debut is a great bit of early melodic death metal. A lot more black metal than their later stuff, but with the catchy melodies and rock drumming that characterize a lot of their stuff. There are some standouts like Clad in Shadows, Behind Space, and Upon an Oaken Throne, but it's a very consistent album throughout.
Amon Amarth's third album gets lost in the shuffle a lot, being the third of four albums that look and sound fairly similar, but it's got some really really strong songwriting and some killer riffs. The last 3 songs sorta form a single story, which is cool. Viking as fuck.
This is a newer one and likely to prove controversial, but I stand by it. The songwriting is tight and the riffs are snappy. I feel like these guys get a lot of hate because their logo lumps them in with the retrothrash crowd, which is decidedly not what Skeletonwitch is about. The core is thrash, but there are elements of melodic black, death, and old school speed metal floating around here. I suspect a lot of people here haven't given the Witch a fair chance. Do it.
Snakes for the Divine just fucking crushes. Am I the only one who gets HoF? Wake up, sheeple!
An all-time classic album? No. It's pretty good, though, but it also gets a reasonable amount of love so I'm not even sure it's overlooked.