I think a lot of the responses in the poll are based on the age group of the respondent. Generally, people who grew up on '90s music think the 2000s suck (usually based on their take on how hip hop changed). And generally, these ppl love '60s and '70s music because of how it inspired great later music.
Their take on the '80s is ambiguous because they have some nostalgia for this while also agreeing with the hatred for the '80s that came from the 60's and 70's musicians and audience.
Most ppl don't like the music that follows their teens and twenties since they are overwhelmed with their favorite music and don't have room to take in new shit. Also, any innovation that moves from their formative years' music is seen as somehow sacrilege.
The person who said that every decade has wack music is right, especially since the growing corporate control of music in the '50s but bubblegum goes back to the early 20th century at least.
Da Universal Magnetic Bitch Oppressor
"Oppressing bitches individually and in groups since 1976"