it's too short :)
RTL for me though, mainly cos of the dynamics in the songs and how it blew everybody away musically.
But sure KEA is one of the greatest things out there

Kill 'em all flaw - too repetitive (also its kind of not a metallica record)
AJFA is slightly better even if it has barely audible bass.

Yes, there were quite a few songs that Dave Mustaine was partially responsible for, but I wouldn't say that it was mostly his work.

It actually was when you listen to it you can hear it.
Kill'em All sounds mostly like a Megadeth record.
The speed, the jammy happy melodies.
After Dave was kicked out, Metallica never sounded like that.
They were always darker afterwards.

I would agree with you, but I honestly don't see how KEA sounds like Megadeth. The riffs are nothing like the technical Megadeth riffs. And the speed is nothing compared to Killing is my Business. Check the credits, his input was not THAT big on KEA.
Yes there are parallels but so what? Metallica never sounded the same again cos of the 2 new songwriters (Cliff and Kirk) aswell as the new producer Flemming Rasmussen).
If anything I would say that RTL sounds more like Megadeth cos it is more complex.
As for AJFA, I love it but it drags on a bit. Now that album was a bit repetitive and forced.

Very true. Maybe that's the reason why I love Megadeth so much as well. I think lyrically AJFA is superior, but the overall quality of the songs on Kill em All is just better.