What if the Decepticons invaded the DC universe?

Every Decepticon that has ever existed including titan bots like Trypticon and the near endless amounts of regular bots on top of the already large cast named Decepticons.

Just DC earth so only earth bound heroes.

Well I assume Batman and Martian man hunter would escape the battle field and then formulate a plan whilst Superman, Captian Marvel, and the other high level characters hold them off. After Batman and Martian man Hunter plan they could come back and even the odds. I would also assume that CADMUS and the United Sates military could lend assistance. The "less crazy" villains like Bane, Lex Luther, and other amoral villains could also help out. As long as you count the entire JLA as Earthbond. If not then Batman with prep could probably solo via hell bat or insider armor.

They would get scrapped.