Depends on how high up the meteros are falling from, doesn`t it? She is just summoning them out of thin air some place above the enemy.
No, it would depend on how fast they are moving at the point of impact, and how much mass they have. With those values we can determine the momentum and the kinetic energy contained and go from there. But I suspect no one really wants to start busting out the math.
Unfortunately, the game series has always been one that sees some disconnect between the Lore and how the Gameplay plays out. Sometimes for tech reasons (not being able to do horned Qunari with the first game), sometimes because we aim to just make something more fun. And unfortunately, for myself as a gamer, I can see the fun in having an ability like this.
Mostly because it provides a choice for me as a gamer. It informs me that "some obstacles may be passable when it's not immediately obvious." It shows that how I spec a character can open up different paths for my party. These things are things I consider valuable in my RPGs.
Yes, no decision will make everyone happy, and if this is a situation of us just taking things too far for you to support, then that's the way it is and it's fair of you to think that. Do what you think is right for yourself. But given that similar actions like these have historically existed in Dragon Age games, stuff like this will very likely still be in the final game.
On some level I agree with the notion that games are about fans and developers both starting from their spot and meeting somewhere in the middle. If a player and game can find that meeting spot, they'll probably enjoy the game, but if not then that becomes less likely.
RPGs are pretty common for this sort of logical inconsistency, and personally I don't really see it as a negative either. In a cutscene a quick hit with a single arrow or a murder knife results in death. If we wanted consistency in the lore, it would seem like we'd actually require hacking away at someone, which I do not think is necessary.
If you're seeing this as some reason to toss out the "awesome button" pejorative, however, then it seems like the DA series has always contained the "awesome button" because this stuff has always existed in the game.
We try to make the games and gameplay interesting and fun. Obviously, what works for some people may not work for all people.