"The beginning instrumental ‘In Tenebris’ actually manages to powerfully sets up the album with meaning"
How does it do that?
"In a sense, Power of the Dragonflame may seem nothing more than an overblown power metal album." (and so on)
But then you say this won't cross your mind while listening. The first sentence isn't even mentioning then honestly. You're trying to convince and inform people who hasn't listened to this that this is a 5 so don't say this. Instead of saying this why not go more into why the instruments are so stunning and exactly why there's never a dull moment rather than saying what can easily be misinterpreted.
I think my adolescent exposure to 70s Rush, Yes, and Genesis made the length not a problem for me. I heard "Gargoyles" in it's entirety before all other Rhapsody of Fire songs, and I loved it enough to order the CD.