Uncle Bulgaria started with the words "I don't think", so I assumed he was going on to talk about what he thought i.e. his opinion.
I did read the bit where you stated "... any one of his symphonies
is much more musically interesting ..." (my bold). I can't find the bit where you said that that was just your opinion. But I knew it had to be, because if it was a hard fact then everyone, including my pop-loving teenage nieces and nephews, would have to agree with it, and I'd bet my pension that they don't
. So I did call it an opinion, as you just have, and of course you're absolutely entitled to it
.
Cheers,
GJ