Not sure if this has been mentioned already or not, but it really annoys me when you are confronted with a character in one of those you-can't-win type of fights and later on the very same character who destroyed you in one punch joins your party and he/she is really not all that powerful all of a sudden. FFIX and Grandia come to mind here and I'm sure a few others as well.
At the end of each battle, your character's HP will be totally recovered! The game is being tuned so that individual battles are tough and you won't win unless you think.
Not really sure how that's going to work out...It's probably going to be the first RPG to use this kind of system as far as I know, unless you want to include all those games that restore the characters' HP upon leveling up.