My Arms, Your Hearse is the album where all of the songs are just super good. It has a perfect mix of heavy and melodic moments combined with really good growls and clean vocals. Amazing album.
In my opinion, Mezmerize is one of the best System Of A Down albums, right next to Toxicity. Songs like Question! and Lost In Hollywood are what make this album amazing. It's a great album and enjoyable to listen to.
The Urn album does get kinda boring but it also has some breath taking moments that just makes it worth the listen. It's a pretty good album and I would highly recommend it. The only criticism I have is that some parts of the songs do drag out a bit long. Pretty solid album though.