Oh, it’s this topic. 
Well, I believe the main issue was the lack of actual scientific justification for most of the issues. Yes it’s a game, but it’s completely unrealistic even if the main premise “humans hurt the environment!” has basis in fact. Propaganda is not inherently bad or evil, but the fact you called this a learning tool goes a long way toward proving the point. Look up the definition of propaganda, then try to back up the in-game science with facts and logic. When you inevitable can’t, that proves it is, by definition, propaganda.
Yeah, we got into a pretty lengthy debate over the science (or lack thereof) in the game and it’s potential application in educational environments. I suppose I could always page @Teleros & Co. for Eco Debate Round 2.