I don't like the engineer anymore, what shining intellect thought of single target grenades??? friggin' nades dude, they're tiny bombs not throwing knives. With so many tightly grouped mobs, I think every class needs some good AOE capability. On top of that any one who knows any thing about cannons knows that "grape shot" is loading the barrel with lots of small pellets, like a shot gun. Give it a 10 or 15 yard max range, point blank AOE, 45 degree arc, and the closer the enemy is the more damage they take, that'd be some "grape shot." Maybe some Knock back rubies too.
End of rage post.