Originally Posted by mr dave

you mean aside from being the biggest and most successful of the 4 main bands widely credited and accepted with transforming metal from some outcast fringe style to something that is widely respected and recognized around the world? (this had already happened prior to the Black album - that album Led Zepplinized the band, it no longer became a matter of whether or not they were tops, but how much bigger they were than 2nd place.)

you don't need to like them, but if you can't consider their achievements without filtering them through the bias of your tastes first then your opinion on their accomplishments is worthless.