Spit Out the Bone is the best Metallica song since the ...And Justice for All record, in my opinion. I also dig Atlas Rise quite a bit. Love the Maiden-ish guitar in it. Moth to Flame is good too. After that...a lot of it just sorta bunches together.
admittedly, I haven't really liked Metallica since the Black album. I liked a few songs off the Loads, but that's about it. Even the Black album...too polished for a thrash titan to my ears. But I check out every new studio record. Hardwired...to Self Destruct, to me, is probably the most consistent work since Load. And I'd probably put it above Load in terms of my listening preferences of the studio material. Probably along these lines:
...And Justice for All
Master of Puppets
Ride the Lightning
Kill Em All
Black Album
Hardwired...to Self Destruct
Load
Death Magnetic
Reload
St. Anger
What Hardwired...to Self Destruct showed me, is that Metallica is still a metal band, but the guys are really at odds with the type of music they enjoy, as opposed to the music they pioneered. The latter isn't something they want to do all the time (like Spit Out the Bone), but they are good at it. The former is something they want to write and play more, but aren't as good at it. And so they are still trying to find a balance. Hardwired (the record) has succeeded in achieving that balance to a degree, but is still skewed in the wrong direction (to my ears). They need more thrash. But that may not be where they want to be...