Why don't you just go to imdb.com and look up "Night of the Living Dead", MtheGM....then read Ebert's review of it (under critics' reviews), then read some of the public's reviews of it from people who liked it.

You will find out exactly why a lot of people think it's a great and innovative horror movie. All your questions will be answered! That doesn't mean you'll be satisfied...(Hardly! No one is ever satisfied by opinions that differ from their own.)...but at least you'll know WHY other people think it's a good horror film.

;-)

Do it, man! Go there now and read the reviews. I dare you.