st. anger

For me the issue is that for oevery great riff/part of a song, there is an additional 5 minutes of seemingly uninspired crap. Invisible Kid is a great example, the first 2-3 minutes just rock, but then it just trails off. Sweet Amber is really good though, and one I blast every now and then. Purify is close to being "so bad it's just awesome"
 
crappy snare

drawn out/repetitive songwriting...if you're gonna write an 8 minute track, it better have a lot more shit going on that those songs do. see: MoP, AJFA

shitty lyrics

no solos

james still can't sing for shit

all in all, i was just pissed that it was hyped as metallica's triumphant return to their roots, and it came out sounding like a bunch of clueless high school kids