Wow seriously?
Every game in this series is so fucking easy. In the previous games, all you needed to do was buy the double machine gun and nothing but damage buffers until it was doing 6-7 per shot (also saving all upgrade points for damage) and then building a shield generator to protect the machine gun.
This game takes it to a whole new level of easy, build a SPREADING MACHINE GUN and do the same thing. Now you have a gun shooting 3 bullets dealing 7 damage each that's incredibley easy to aim at the enemy's weakspots. To all you saying this game is hard: you fail.
Doesn't mean it wasn't fun however, I still give it a 9/10, -1 star for lack of something like a challenge mode. :(