I never got a chance to listen to Fake History so this is my first experience with the band. Basically this record has everything I hate about (modern) posthardcore. I don't like the energy, it's too hectic for it's own good. It sounds like their constantly ripping off Refused and Glassjaw (which I both really like).
The production is awful, but the worst part is the clean choruses that they do too often. They ruin the flow of the songs and his "harsher" vocals are already extremely intelligible and clean imo, he could have kept singing the choruses with them and I wouldn't mind it so much. Some parts come off as really cheesy like Banshee's gang vocals "when they say, when they say."
And I also found the whole thing extremely homogeneous. I enjoyed Banshee when I first heard it, but got bored of the album by the 3rd or 4th song. Now, I can't really stomach listening to this at all.
All of the above makes you exactly the person this review is aimed at. Like I said, there's a definite learning curve to this record, and my review's goal is to provide the roadmap past the barriers to entry, so you can enjoy the songs.
That said, I'm not exactly sure what kind of post-hardcore would please you. You say the record has "everything [you] hate about modern posthardcore," then claim they're constantly ripping off Refused and Glassjaw...which isn't modern posthardcore. Those seem to be conflicting thoughts. And I really can't name a modern posthardcore band I'd compare Letlive to - would you mind naming a few? Curious who out there compares.
Also, I think it's incredibly tough for The Blackest Beautiful to be your first exposure to Letlive. Fake History is more straightforward with better production - it's a much easier first listen.