Sorry, I am confused. Are people in this thread trying to say The Mystery of Time is a better album than Operation Mindcrime? If so, then wow! Just wow! One of the greatest albums of all time (and probably my number 1 vocal performance of all time) v an above average power metal album. Sure I love Avantasia but sorry no album from Avantasia can compare against Mindcrime.
I sort of understand where you're coming from, but...
I think everyone has opinions like this. By which I mean, there are surely plenty of beloved classics in genres and styles that aren't your favorite that you would rank below above-average albums in your favorite genres. Like, I imagine there's some jazz or EDM or punk album that some people regard as one of the greatest albums of all time, but that you would put below an above-average prog metal album.
This is normal because when people talk about best and worst albums, they're largely talking about their own enjoyment of the music. They're usually not claiming that they've found some way of objectively evaluating music and that they have rated these albums accordingly (and if they are claiming that, I think they're almost definitely wrong). They're just saying, "I like the one better than the other."
Here's an exercise to illustrate this: Pick an album in your favorite genre that you'd call "above-average," go to the
Rolling Stone 500 greatest albums list, and count how many entries you would rank below this above-average album. I think for all but the most diverse music-listeners, it's going to be a lot.
FWIW, I'd also put TMOT above O:M. And it's solely for the reason that I enjoy it more.