Jeez, Blue crow. You're such a Megadeth fanboy, and hardly know anything of what you're talking about.
Dave & Cliff may have played a rather big role in Metallica, but they weren't the whole band. Cliff was amazing, but he didn't write every song, he didn't do everything. And neither did Dave, there's also Kirk, James, and Lars... Lars & James who did most of the lyrics on all the albums.
You keep asking for good songs, but what's the point? It would just be our opinion, that you would most likely shoot down with "Pfft, whatever.. Megadeth > Metallica" and then follow it up with a silly list of Deth songs claiming to be better than Tallica's. It would lead to a pointless argument with nobody winning, Sorry but I won't be getting involved in that.