Perhaps, but I suspect it then lies with a difference between why the player's making the choice and the choice we're actually providing them. At no point is the choice "kill Isabela" offered, just as at no point is the choice "kill Leliana" offered. If someone thought the Qunari would kill Isabela, that's fine, but the fact they didn't doesn't change the fact that the choice was to turn over the person they wanted in order to get a peaceful resolution with the Qunari... which you actually got.
I actually think that the choice to turn over Isabella is one of the most meaningful choices you can make in the game. It affects a couple of things:
1. There is no battle at the end of Act II (immediate impact, since the battle is non-trivial)
2. The Qunari leave in peace and the Arishok survives (could have ramifications for both Kirkwall and the Arishok in the future)
3. Isabella does not participate in Act III.
4. Not to mention the emotional impact of feeling either "oh, I betrayed a companion" or "that b*tch finally gets what she deserves" -- which is all subjective, but perhaps the most important aspect.
That's a great choice. That's the amount of choice that I want to have. I don't see choice as "I want it, therefore I get it", but "I chose and it affects the outcome of the situation".
*offtopic warning, not about Isabella*
The problem with false choices is
a. choices which have no impact outside of the conversation they are used (and perhaps a few approval points here and there)
b. choices which fail to give me the alternative that seems most reasonable and in character for me to take
My "worst choice example of DA" is the whole quest of Sheperding Wolves: I don't get the choice of watching Petrice get slaughtered in an alley; I don't get the choice of not taking her mission; No matter how hard I negotiate and try to appease the Qunari and fulfill all of their demands, they will attack me.
Finally, I catch the person who is responsible for this setup, wanted to have the city in flames, wanted to have me killed. I catch her at a place she should not be, with only one bodyguard. So I have reason, will, force and means to kill her. After wading through a sea of blood that others forced upon me, I finally want to make the decision to attack. But I only get to say to her "bad girl!" That just makes my helplessness and lack of agency so obvious.