Not really fair, I would say.
The atlantic level is so hard but nothing abit of gauss can't fix!
My advice to anybody that starts playing- for the more advenced levels equip your soilders with atlist one sniper rifle to take care of enemy snipers. You should also get the minigun which is good for combats. Flamethrower is good for the first levels and for close combat since it kills enemies really quickly, but becarefull of longrange weapons, with a flamethrower you wont stand a chance.