While I share some of your criticisms, I still feel the game is an 7 or 7.5/10. The game starts drag near the end. Typically I'm like trying to get all the side quests in an RPG done. I got them all done in Remake. In Rebirth, after I hit Chapter 12, I just wanted to get to the end of the game. So, I just focused on story quests and until the end. I took a couple of months away from the game in chapter 12 actually. Rebirth is a little to bloated for my taste. It's not Ubisoft bad but it was enough for me to take a break from the game.
Side note: Full disclosure, I don't like the original FFVII so my views may not coincide with thoses that do.