Bushwacker by himself has a pretty lackluster ability. I can’t find any purpose for it, even after 100 hours ingame, I just don’t see it happening.
However, Engineer is always useful to the team, and the top KEK is also the best SMG in the game (open to discussion). And in a 5v5, there won’t be nearly as many explosive classes to take down a turret. Of course he still sucks in pubs.