These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: While Back in Black is universally loved, there's always a Scott vs. Johnson feud in the fandom.
There's also divide over the band's Strictly Formula nature. Some are unsatisfied with it, while others believe that they've simply found what they're good at and never tried to be anything other than what they were.
Angus has joked about this in interviews.
"People say we've made the same record over and over 13 times, but they're wrong. We've made the same record over and over 14 times."
Crazy Awesome: In live concerts, when they play Hell's Bells, Brian Johnson will swing from the bell that gets lowered onto stage upside down.
Ending every show with a literal 21-gun salute in "For Those About To Rock (We Salute You)" might qualify as well.
Ear Worm: Many songs, specially because of their repeating choruses and Epic Riffs. "Back in Black", "Highway to Hell", "It's a Long Way to the Top" and "Thunderstruck" withstanding.
Epic Riff: "Back in Black," "Thunderstruck," "It's A Long Way To The Top," "Mistress for Christmas," "Beating Around the Bush," "Fire Your Guns," "Hells Bells," "Jailbreak"... seriously, every song may qualify.
Jumped the Shark: many people have commented that the band haven't been good since Back in Black and are now just repeating their formula without the energy and edge that made their early work compelling. Rolling Stone said in its review of Flick of the Switch that "the band has managed to make the same album nine times".
Re-grew The Beard: They had a big comeback with the great The Razor's Edge in the '90s. The album produced some of their famous songs (like "Thunderstruck"), its follow-ups Ballbreaker and Stiff Upper Lip were fairly well recieved, and 2008's Black Ice got critical acclaim and was that year's second best selling album.
Ask others and they'll tell you in no uncertain terms that AC/DC never lost the beard to begin with. Granted, they might have trimmed it a bit, but they never lost it.