As to the Metallica and Lars Ulrich thing first I want to say that I am by no means a fan of Metallica and I support Dave Mustaine and Megadeth on Metallica stealing Mustaine's songs, but to my original point.
I know it wasn't your original point but you posted it so I have to counter it :biggrin: .
They wrote the songs together. Even if Mustaine brought 75% of the riffs used to the table they still got messed with during practice/gigs making them the bands songs. At that point the songs became Metallica's. Then Mustaine got the boot for being an angry drunk and the album was recorded shortly afterwards.
I love both bands myself, you can't deny Metallicas first 3(4) albums as being in metals top tier and you can't deny Megadeth's great catalouge either.
Mechanix >,=,< Four Horsemen ? Who knows? When me and my friends play it we start at the horsemen tempo then 1/2 way through we blow the lid off and jump to or past mechanix speed.