lol, I've heard plenty of complaints about the reactions in solasta.
I've heard plenty of voiced approvals for the reaction system in Solasta. Of the people who state they've actually played the game, I've seen fewer complaints than compliments, and most complaints focus on frequency of pop-ups for Sorcerer's Metamagic or Paladin's Smite,
neither of which are actually reactions. People who complain about popups for Paladin's Smite overwhelming don't specify that they had a problem with the AoO prompt itself.
The source is our memories of posts, compiled from both this and Solasta's forum over the nearly 2 years that Solasta and BG3 have been out (in some form) for.