You have to put the Cliff thing in context - at the time (with the possible exception of Billy Sheehan and Geddy Lee, who were more in the "hard rock" camp), he was the only metal bassist playing like that, with that level of chops, and with that degree of musicality. In 1984, 99.9% of all rock bassists pedalled the root and nothing more.
Cliff brought his NWOBHM and proto-punk influences, mixed them with a good dose of influence from his bass heroes - Geddy, Stanley Clarke, Lemmy and Jaco - and came up with his own thing that, at the time, hadn't been done before.
He also brought a considerable knowledge of classical harmony to the band - all the more orchestrated and harmonised stuff that started to appear on Ride The Lightning was all down to Cliff. I've heard Hetfield say in an interview that Cliff taught him and Hammett how to write harmony parts, and introduced them to classical music. Of course, this aspect of Metallica's style has been aped by many, many other bands over the years, and Cliff was the one who brought it into Metallica's repertoire.
Have there been better metal bassists since Cliff? Sure. But at the time, he was groundbreaking.
Cliff brought his NWOBHM and proto-punk influences, mixed them with a good dose of influence from his bass heroes - Geddy, Stanley Clarke, Lemmy and Jaco - and came up with his own thing that, at the time, hadn't been done before.
He also brought a considerable knowledge of classical harmony to the band - all the more orchestrated and harmonised stuff that started to appear on Ride The Lightning was all down to Cliff. I've heard Hetfield say in an interview that Cliff taught him and Hammett how to write harmony parts, and introduced them to classical music. Of course, this aspect of Metallica's style has been aped by many, many other bands over the years, and Cliff was the one who brought it into Metallica's repertoire.
Have there been better metal bassists since Cliff? Sure. But at the time, he was groundbreaking.