@3DJRDMy reply has seemingly been removed for some reason. Not sure if it was for being off topic or something else, but since this is related to balance.. and its the patch notes I think its on topic. I will now rewrite it like a total loser as I do want to back up what I said. EDIT: Looks like my orginal has returned, but I think I'll stick with this one.
The reason I want engineer nerfed is because he is ridiculously unfun to fight in his current state. The engineers primary weapon does an extreme amount of damage and is incredibly easy to use. You don't even have to try that much when aiming as your bullets will just bounce. If by "no longer explode on impact" you mean he no longer does splash damage, he doesn't really even need it, does he? Like I said, his weapon is already incredibly forgiving to use. I understand he can't shoot on the jack hammer, but he doesn't even need to as his turret can do that for him. His turret is also insane right now, and always will be incredibly unfun to fight as it is an auto aiming ai, its not human, it won't react like one. It will instantly catch out stealth night caps, or any character really. The buff it provides is very unfair, as it just makes his already powerful weapon even more powerful and forgiving. It should probably only buff his team, not him. It makes the engineer a very.... spammy character.
I have to disagree with him being weaker in 1 v 1s than he was in the first two games. In fact, I think he is as powerful as he's ever been in 1 v 1s. He has a 5 second long stun to completely disable a plant, its kind of sad to watch happen actually.
Engineer is by far one of my least favorite classes to fight currently because of the auto aiming ai, incredibly powerful/forgiving primary, and... the 5 second long stun. He's currently labeled as support, just like the Rose and Sunflower. Something has gone horribly wrong if the engineer in his current state is supposed to be playing the same role as the Rose. ):
