@Phoenix32890,
I know that the producer of NLD, George Romero, is loved by many in the small cult of us oldie cinema lovers. There has been some sequels to it, namely Dawn of the Dead by Romero (1978), but nothing IMHO, touches the original. Dawn was pretty decent, FWIW. In fact some good critic/reviewers rave about it!
Here's the famous cinema reviewer Roger Ebert's review in 1979:
"Dawn of the Dead" is one of the best horror films ever made -- and, as an inescapable result, one of the most horrifying. It is gruesome, sickening, disgusting, violent, brutal and appalling. It is also (excuse me for a second while I find my other list) brilliantly crafted, funny, droll, and savagely merciless in its satiric view of the American consumer society. Nobody ever said art had to be in good taste.
It's about a mysterious plague that sweeps the nation, causing the recently dead to rise from their graves and roam the land, driven by an insatiable hunger for living flesh. No explanation is offered for this behavior -- indeed, what explanation would suffice? -- but there is a moment at which a survivor solemnly intones: "When there is no more room in hell, the dead will walk the Earth."