You'll find in this masterpiece album for the first time a sound that is a right combination between the best of Megadeth in 80s (excellent rhythm, speed and variety), and the best of Megadeth in 90s (refined harmony, melodic line that makes sense from the beginning to the end of a song, controlled solos, the voice is well defined not a grunt as in 80s).
Lyrics are again cryptic, powerful, childish, stupid and intelligent at the same time, which is an interesting trademark of Megadeth (don't count United Abomination that was a true abomination of poor ideas).
This album is extremely consistent. So it is up to the listener to establish what song fits better with his taste or mood. I will not highlight any song because there is no Angry Again or Secret Place in this one - meaning there is no one that stands up far above all the others.
Go grab it and enjoy it!