What Cerberus needs is a redemption, honestly. Not a 180-turn about where they stop fighting Shepard all of a sudden, no. Just something where no matter what, it makes sense that Shep and Cerberus come to an irreconcilable disagreement. And how much do you want to be it deals with Reaper tech? Just like the end of ME2, Retribution, and Evolution? When it comes to Cerberus, it's always about Reaper tech. Not a stupid, Saren 2.0 reasoning. "We can't beat them, so we're going to kill you instead."
Yeah, no, sorry.
And I can see why Shep and TIM would disagree about using Reaper tech easily. Sovereign: "By using our technology, your civilizations develop along the paths we desire." But if TIM's actions are as lulz-ily stupid as they have been in the books, comics, and parts of ME2 (Hey, look, a Reaper. Let's hide it from the council and go study it and not tell the only human expert on reapers about it until it's too late! Because that's a good idea!) then I am going to be severely disappointed. I like TIM. I HATED Cerberus and what they did to my Sole Survivor Shep in ME1.
But ME2? Well... despite their past actions, I was willing to "give them a chance. One chance."
And despite all of the trouble TIM puts Shepard through, the logic was there. High risk, high reward. Just like the Vanguard play style. And my Shepard approved. TIM's actions are questionable, but he (most of the time) accomplishes what he wants to. Even in Retribution, things turned out in his favor. Cerberus is capable to an extent. The fact they are treated as such is what makes it ridiculous when every single other operation of theirs goes wrong. It's getting old. And fighting Cerberus just after being their allies is almost worse.
BioWare needs to make up their minds. What is Cerberus? A joke? Or a powerful paramilitary group, ruthless and cunning?
An enemy or a friend?
Cerberus does not need other race equivalents. It's probably too late now for it to be anything else but the schizophrenic bipolar joke BioWare made it to be. Flip-flopping an organization's role every game made Cerberus a sham.