I played the recent edition of Space Hulk with my brother, who insisted on playing the entire campaign as the Space Marines (bad idea - they tend to lose!)
He gave up the campaign about half way through, becoming frustrated with his 10 game losing streak.
I thought about how to make it easier. He consistently became distracted by his phone during his (timed) turn, leading to tactical blunders.
Does removing the timer element make the game much easier, or is it still likely that the space marines will lose?