Haba
Harbinger of Decline
Problem is, it's a rather subjective issue. One man's "meaningful choices and impressive reactivity" are another man's "It all feels the same to me". All I can say is that so far, the majority opinion seems to be that Tyranny's reactivity is decent. Even a good number of people who don't think the game is good overall seem to think so.
More than a "good number" of people thing Oblivion is the greatest RPG ever made. Current year standards.
Tyranny is front-loaded with it's reactivity, it is built to give the early impression of your choices having major effect on the gameplay. Ironically you make the most impactful choices during the first minutes of the game. They are a literal coin toss to the player at that point.
Once you leave act 1, the game becomes a linear rail-road from one forced combat encounter to another.
That is of course what mainstream reviewers haven't seen, since they only invested a few hours to the game. That is what most players have not seen, since only ~15% [1] have actually completed the game!
So in conclusion, Tyranny is a rushed out hack-job designed to generate positive first impressions and reviews. It gives the player the illusion that his choices have an impact, leaving his imagination free to run wild about the consequences he'll never see materialize, but which is O.K. since he probably won't complete the game anyway. Everybody wins, current year game design standards.
Welcome to current year RPG Codex, scaled to the majority opinion.
* 1 - http://steamcommunity.com/stats/362960/achievements