i played all guitar hero games from i was 5 for real man that was in 2005 man it change my life and i remember i got sick of it when 2009 which i was 9 came along i was on xbox 360 playing some other games. i started playing guitar hero 2 on ps2 i remember picking it up i was hooked. i even got action figures at toys r us and i still have one which is johnny napalm. i was hooked. guitar hero live came out in 2015 i was 15 and got it on launch. guitar hero was my life and will be and forever be legendary of rock n roll video games.
The ACDC game is essentially just a track pack. Although it was released on a separate disc, it used just the Rock Band 1 engine with no changes (no ACDC performers, etc). Hypothetically, I'd put it in Meh Tier