This is so annoying to look at in game.. SBH is by far the most useful class for Nod if done right. I love picking those Hotwires of one by one with the silenced sub machine-gun . But as you're saying it seems like some people use it as a hide-and-seek class "if i'm unnoticed all game i win!".
And its hard to tell/inform people how to play, figure that many new players come from games where you're playing a multiplayer game singleplayer.
Maybe some day we could have a Tutorial with the basics