To put it in another way, most genera of music cannot be classified as good or bad.
But when a genre like rap/hip-hop gets filled with artists who don't have a clue as to what even singing in key is, that kind of music degenerates to what I would personally call bad music. I mean Tupac, Public Enemy used to be okay back in the day but most of the (c)rap that comes out now is plain boring and sad.
-- My current rig
Guitar: '98 MIJ Ibanez RG520 QS w EMG 81/60
Amp: Laney LC15R Tube, Fernandes 20W SS
Pedals: MI Audio Tube Zone Overdrive, Boss OD3, CS3, MT2, HM2, DS2, CE5, DD7, TU3, Beta Aivin DD2 Delay, Dunlop Crybaby 95Q, Stranger Vol Pedal, BBE SupaCharger
Others: Yamaha RBX 374 Bass, Yamaha MM-6 Synth, M-Audio Fast Track, Shure SM-57, Heet Sound E-Bow Plus
Wanted(pm if selling): EB VPJr/Boss FV500L,Ibanez w Original/Lo-Pro Edge