Tales series? Frustrating? Are we even playing the same games? I can't remember that last time I was ever frustrated in a Tales game, either with its battle system, or a part of the game that wasn't an optional boss, and I'm not all that good at games. Maybe the first hour of Xillia, because I had come immediately off of Graces f and expect the same battle system only to get something completely different? That one Early boss in Vesperia that took me 3 or 4 tries to beat because I skipped a few battles along the way? Other than those instances, Tales games have been pretty easy, so long as you know what you're doing instead of just mashing the buttons, and fight every enemy you encounter so you're the appropriate level. Maybe I'll still die a few times at bosses, but I expect that and don't really get frustrated by it.
And I don't really agree with the dialogue part. That's purely preference, but half the reason I play Tales games is just to read the dialogue and see the interactions between the characters. It goes a long way in making the games a fun, memorable ride, at least for me. Though I seem to pay more attention to dialogue than I've seen others do, so take that for what you will.