Personally I think that the 80s has the best music and the 70s with a very close second. Worst I would definitely say 2010s I like almost nothing from there except metal bands and the occasional EDM producer.
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I feel like the current scene of "indie rap" is just the worst. Sure the teen star age of Justin Bieber and clones was kinda trash when they all were the same, but currently there's so many "rappers" copying eachother that you could give me a 10 hour playlist of different artists and they would be indistiquishable. Even worse when the lyrics are just corny and one dimensional trash or just bad mumbling attempts.