I don't think that that the song is outdated and the performance is over the top - I'd actually say those are facts, not anyone's opinion. But some people like that, some not.
I don't have a problem with him trying, my problem is that it seems really fake. I want all the best to people who try from their heart to succeed, but it seems that Russia wants to win just for the sake of winning. And that's sad.
I think you're using the word 'fact' in the proper context. Whether a performance is over the top, is completely subjective, therefore cannot be considered a fact. That's like saying it's a fact that I look good in Red when somebody else thinks I look better in blue. It's an opinion. I don' think it's over the top, I think it's actually quite creative and entertaining. You obviously don't agree but it still doesn't make it a fact.