I almost didn't get this game due to all of the negative reviews, but I'm so glad that I did. I really enjoyed this game. Yes, the characters move slow, but that's part of the game and you have to plan accordingly.
It's difficult to earn 3 stars on every level, and you need those stars to upgrade your people and equipment. The good news is that once you upgrade you can go back and replay previous levels to get all of your stars.
I finished the game but was not able to get 3 stars on all level. That's okay. I can just keep trying.