Would have given it a 3 at best. Was a fun time killer if I turned off all data and was able to bypass ads when on data only. It's fun to get a wave of blue guys built up to overwhelm the enemy. The leveling progress didn't matter since it was just to kill a few minutes. I liked finding a cannon that fit my play style, but now with the new "card" system I can't choose what cannon to use. So I'm deleting the game because I can't play how I want to play and it's become too restrictive & less fun.