I don't agree at all with the "Cliff was mettalica. End of story".
IMO, that's totally wrong.
The real spirit of Metallica is James Hetfield.
He's the big boss, the main composer, he writes the lyrics etc ...
Lars is the big mouth. He has influence on Hetfield but would have none nothing without him.
Cliff was important and I loved the guy and his playing but don't be too bass-focused on this group.
Kirk, well ... hum ... nice soli !

I think Hetfield could have bear the whole Met thing alone.
Look at the videos, look at the credits ...
Word is that Ulrich is often/always credited because of arrangment/producing and because he's a big mouth.
I'm not sure he really deserves it.
Though I agree, he's a terrific drummer, IMO.
Of course, it's my opinion and I can be wrong and so on ...
Of course, I totally understand that some people don't like their music anymore. They've changed (evolved ?) ... me too ... we're in phase ... good for me

But the continuous easy bashing on bass, drums or "it was better before" about Metallica is getting boring.
I'm pretty sure that if they haven't gone mainstream but stayed in the underground scene, a lot less people would bash them.
It's so cool to spit on the big bands and just listen to underground bands, isn't it ?
Smells like teen spirit to me ...