The differences between A-Artes and B-Artes weren't clearly explained to me through the game, and the manual didn't help, so I had to resort to the internet to find out the differences. That alone is bad game design.
From there, I don't really like the A-Artes because the left and right arts are usually really good, but I can't change them to forward or back, so when I execute them, I end up sliding into enemies and they end my combo. I've also noticed that A-Artes don't really stun enemies as good as B-Arts, so I'm always getting hit while using them.
I end up using B-Artes more because of this, mostly because drawing Asbel's sword grants him instant Iron Stance and hits every enemy nearby since they love to gang rape the active character, but even then, it's only a few hits until he gets stunned, and you get stunned hard when using B-Artes.
Free-run also seems useless, unlike Abyss' and Vesperia's, since you seem to move slower in Graces when free running, and you only use free run to get away.
The AI controlled party members are also pretty sporadic. When I was using Asbel, Cheria, and Sophie, I was taking the full brunt of every enemy on the screen, while Cheria and Sophie just dicked around far away from everyone, and only occasionally healed me, or attacked the enemy. Changing their battle strategies didn't help this. Then, when I ended up with Asbel, Richard, Pascal, and Sophie, we were a non-stop dunking machine... except for Sophie who still wouldn't really do anything no matter how hard I changed her strategies.
Then, just when you get the hang of it, the game starts throwing titles at you. It's nice at first when you have one title you're working on, and maybe two in the back log, but I just got Pascal in my party, and I'm about to leave the ruins, and Asbel alone has like, 20+ titles that I haven't even touched yet, and he just keeps getting more and more.
I dunno if this is just me nitpicking, or if I just really liked Vesperia too much, but Graces isn't for me. I've realized this.