Hey RR (again):
Funny thing you should mention the Moody Blues, but firstly I must agree about the charts back then. Ken Dodd famously kept The Beatles off No1 with "Tears", we used to call it mums & dads music. Matt Munro, Frankie Vaughan, not to mention novelty acts like The Chipmunks. Teenagers had to fight spending their hard earned pennies on even one single a week, and would usually share their collections so it was fairly easy for a mainstream entertainer to headline. Here in the UK, we didn't have the specialist charts of the US.
Back to the Moodys, I think the negativity to them at the time was largely 'from the streets'. Their 'symphonic' style was largely seen as too highbrow by half. After all, if you took an album to a party you wanted to dance, drink beer and hope to get laid, (well steal a kiss at least!), sitting around 'appreciating' music was definitely for the "hippies in the corner" who largely sat around looking miserable!!
Of course now, I am very grateful that I bought all the 'Magnificent Seven' on vinyl at the time. Apparently the master tapes have been lost and the remastered CDs now available have been remixed. Very good they are, but not the originals. I've always loved that the very last track on the last album is "I'm just a singer in a rock and roll band". Says it all when we start taking all this stuff too seriously.