I get what you mean regarding the big hook in the vocals. JLB sounds good on this record, but it does feel like the melodies have been "dumbed down" a little in order to coincide with his current capabilities, thus the big hooks aren't there like in the past.
As for Mangini, he is obviously a beast of a drummer, but five albums in, I just don't connect with his drumming on any real level. I always joke that my favorite drummers are the ones who get me to air drum on a regular basis - Peart, Portnoy, Bonham, Beauford, Collins, Moon - and I rarely air drum to Mangini's parts. He is definitely an asset to the band, but he just isn't someone I would call one of my favorites.
So I finished listening through, and then got another whole listen in as well, and honestly nothing has changed. I finally heard the two best songs on the album - Transcending Time and Awaken The Master - but they don't quite transcend the things that detract for me. The only chorus or resolution with any ooompf to it for me is in Sleeping Giant, at the end when James comes back in after the interlude. Pretty powerful, but only relatively. There were moments in both Transcending Time and the title track where I was waiting for James to either go to that higher register or at least double his vocal with that higher register (like on the end of "This Is The Life", a technique I love and which can be easier to reproduce live) and he never did.
The Mangini comments are, if anything, amplified. I get what some are saying about "supporting" and I see what you mean, but I think we're saying something different. Almost every track has a moment where Mangini is either doubling or accompanying Petrooch, but playing Morse code on the kick drum while John chugs the lower strings of his guitar - which seems to be the fall back position on the verses of many of the songs - isn't what I mean. I'm talking about something like Phil Collins on the studio version of "In The Cage", where he's playing with tempos to underscore the music, or "Eleventh Earl Of Mar" where he's literally the sound of the marching armies, or in the live version of "In The Cage" where he - and Chester - are essentially calling out the changes in the medley (or answering Tony's call out of the changes in the medley. There's a moment in one song - blanking on which one - where Jordan is playing these earthy, breathy string patches, almost legato lines, and there again is the duh-duh-duh-duh-duh-duh of the kick drum. The best music for me is like a conversation, and I don't hear it in the new Dream Theater. I just don't. That's on me, not the band, I'm not saying anyone "sucks" or has "lost it" or anything like that.
The two leads, though, John and Jordan, are at the top of their game. I really like some of the lyrical stuff in The Alien (at the end) and I think it was in the mid section of the title track. I will say this: I will probably go see them to see this music recreated live. I think it might have the potential to get to another level live.
The tracks for me:
Transcending Time
Awaken The Master
A View From The Top Of The World
Sleeping Giant
The Alien
Answering The Call
Invisible Monster