Formis_Sage wrote...
Well, Shepard will find out some Reaper weakness or we are all screwed in open battle. 
A long time ago, there was a SciFi series on a type of large ships called "Berserkers". Their goal, oddly enough, was the destruction of all life in the galaxy, except for their creators - and the creators had long since died off. But the Berserkers continued.
The Berserkers were pure AIs, and each had three brains - and two had to agree on any action.
The Berserkers were defeated, in one version, by an AI who invaded the Berserker, and then turned the ship on the other Berserkers.
Suppose the Quarians, Legion and the Geth, and EDI were able to introduce an AI virus into the Reaper fleet. Some Reapers freeze and do nothing, others attack their former allies.
That would be elegant, would it not?
Game purposes: Shepard, Tali, and Legion have to fight their way into the core of a Reaper to introduce the virus.