Let's get the most important thing out - Harris compositions are largely sub par to, not only the rest of the album, but even the older tracks they're trying to mimick. It would be like using all his patterns and tropes that make a generic Maiden epic + being influenced by Nightwish. It's completely obvious. Two of the tracks seem to have the Age Of Innocence rambling boomer pattern. Mainly Lost in a Lost World which is one of the worst Maiden songs ever put down on the album. If you feel The Unbeliever was disconnected and not pulled out well, this is far worse. It's a song that manages to recapture every bad thing about The X Factor in a single song, which even The X Factor doesn't do!
Death of The Celts is a Clansman 2.0 without energy and with some nice ideas but overall a very weak and bland track, and it has a rather annoying 'merry' instrumental section. Hell On Earth is another old man rambling, a song that picks up in places only to revert down to mediocrity. The latter part of the song is good, nothing special and by this time in the album's listening session, everything they do here is completely predictable.
The Parchement, is a song that has some fat, but not much, and it's the absolutely best of the Harris solo material on this album - and if you ask me, the only one that really deserves its spot on the record.
With that out of the way,
Senjutsu, Days of Future Past, The Time Machine and Darkest Hour are atypical, heavy, progressive, fresh and high quality tracks. Together with more classico style The Parchement - heavy riffs in this one - and Stratego, and with western sound of the Writing of the Wall, each of these songs is different to one another, but very different. If this were the album, it would be a 10/10 rating progressive metal record.
Senjutsu manages to sound Tool alike and have a few twists and turns around while McB keeps a regular but syncopated beat. The ending has some unique work by mr. Smith.
Days of Future Past is Bruce/Tribe/Smith meets Skunkworks and the main riff reeks of Megadeth's Youthanasia period.
The Time Machine is on the track of being ideal Maiden mini-epic, I can't wait to hear the live version
Darkest Hour has clean el.guitar throughout and is reminiscent of Tyranny of Souls 'ballads', especially the drumming.
Regarding drumming, McBrain just threw a huge fuck you to all the people here that think he's replaceable.
Production is excellent. I can't wait to hear the real thing in full fidelity.
If I were to rate this album without Lost In A Lost World, Death of The Celts and Hell on Earth, it would be a definitive contender for the crown of the best reunion album. But inclusion of those, significantly lowers the average score.
Without any hype or belittlement :
Senjutsu - 8.5/10 (cons : the melodic choruses drop the energy down)
Stratego - 9/10 (cons : no-frills track)
The Writing on the Wall - 7.5/10 (cons : nothing special, the instrumental section raises it up)
Lost in the Lost World - 4/10 (cons : absolutely weak melodies, arrangement, there's nothing to latch onto here, it still has good drums and a couple of solos and a nice intro)
Days of Future Past - 8.5/10 (cons : the chorus is again a lower energy affair)
The Time Machine - 9/10 (cons : should be longer, way longer)
Darkest Hour - 9/10 (cons : absolutely none, but not the kind of a song that you'd say is 10/10 Iron Maiden)
Death of the Celts - 5.5/10 (cons : the thing starts typical and you know what's coming. However it does pick up with a shanty alike groove, and reaches mid song in a good way, but then Mr. Harris delivers his own version of Empire's midsections paired with the worst repetitive tendencies of red and the black)
The Parchment - 9/10 (cons : there's little in tempo variety till the end and there's a bit of an annoying pseudo chorus but the thing ends on a banger. It's using Life's Shadow inspiration in place but without direct theft. Heavy song throughout, supported by staccato riffing which is not the case for other Harris epics)
Hell on Earth - 6/10 (cons : everything before the ending part, apart from some vocal melodies on chorus, but this thing does not sound like "Iron Maiden - Hell on Earth", it sounds like old man saying this life is hell I better retreat to countryside or something like that. In the beginning the band sounds like one of those bad rippofs that would be uploaded as supposed leak. The 6 is not an impression, it's the average between two parts, the bulk of the song which is pretty bad to meh and last third which is pretty cool to great sounding at spots)