The Beatles are here - why not Metallica?

I got into them when accountants & lawyers went into a territorial pissing mode when the band started getting attention.
I find them fun, and while not as good as either the Beatles or Metallica, they are good for listen every now & then.
And groups like this and Dread Zeppelin, Luther Wright & Wrongs, Easy All-Stars usually get me back into the original music.
Why ? It just seems to bring back a freshness to the old tunes that might have been overplayed.

I think it's a nice idea, but it quickly grows old. Plus the singer forces the Hetfield shouting style too much and too frequently.

I've tried listening to them. To be honest, it was not even close to as humorous as I hoped it would be.