The risk is not doing anything useful. If you invade and get 0 kills, or if the kills you get have no motes, you didnt do much to help your team. Its a 1v4 scenario, so against coordinated teams you have a disadvantage, especially when they all have an across map 1 shot in sleeper. Its not that sleeper is op, but it is above average in every category and was hard to counter. Does it sound like another overly used heavy weapon from d1 that got nerfed? It was easy to use with no disadvantage. And bungie did a good job in ensuring they didnt ruin it