Would you buy a dlc that lets the player control/play as a reaper?

I'd love to wipe humanity and other living beings from the face of the galaxy with a sassy giant black cybernetic sepia

Only if I could talk shit like Harbinger. Of course, I could see myself screwing up the lines:

"I know you feel me, Shepard. I mean, this. You feel this. You feel this, Shepard. Oh fuck it. Just die."

"Assuming direct control, bitches!"



For a more serious answer, no. I'm down to play games as the villain, but the playing as the Reapers doesn't seem interesting to me.  The Darkspawn General was far more interesting.  

Maybe. I don't know if what you described is how I'd do it.

"Opposing Force" type games/expansions/mods can be fun to do, if done right. First off I'd expect the Reaper POV to be done right. Pretty difficult to do since what do you go by? ME1 style "we are beyond your comprehension" or the holokid bullshit in which case it's just "beep-boop kill setting intiated"?

Anyway once that's sorted I would expect a full campaign, not just a mission. Start of as a husk and you work your way up. The first mission has a hapless human being turned into a husk, dropped off the dragon's tooth, and it's off to the races. You have to help your fellow husks overrun a meatbag hold out spot.

Husk powers: wall-walking and electrical repulse (ME1 style).
Objectives: kill/stun meatbags, drag them to dragon's teeth to get converted. Eventually you have to wallwalk and sneak into a building where the last of them are holed up. Destroy a power thing so the rest of your bretheren can swarm and kill them.
Location: Benning

Next mission, you're a Marauder, responsible for maintaing order in a death camp. You put down prisoner riots until a rescue team engineers a break out and you're tasked with retrieving/killing the meatbags. Here you get more squad based gameplay as you have cannibal and husk buddies to help you.

Marauder powers: command husks/cannibals, buff husks/cannibals.

The point is to send your squad in as fodder while you flank. If you try to solo it, you get shot down pretty quickly but with clever use of your minions (if one dies, another comes up) you eventually put down the escape attempt and recapture some meatbags.

Location: Rio

Next mission: Brute charging the line- pretty simple, you're a brute charging barricades. No subtlety here, just charge and rip and tear. Powers: charge, chestpound (buffs self), grab kills restore health.

Location: Thessia

Next mission: Banshee.
Objective: meatbags are trying to retake the position you just took in the previous mission. Or maybe they're trying to sneak off with some artifact that'll help them. Doesn't matter, you'll slaughter them all.
Banshee powers: switch between warp mode and normal mode. In warp mode you blink around, can go through walls, melee and grab fools (grabs restore health). In normal mode, you can use warp and Command Sense, a minigame which allows you to spawn reinforcements at key locations. You'll need to use this strategically as you can only spawn a limited number and you can't kill everything yourself.

Final mission: Reaper space battle! Pilot your very own Sovereign class Reaper as you slaughter the meatbags' pitiful vessels. First stage is a timed run, destroy as many ships as you can until the time limit runs out. This is merely a distraction to draw more fleets to you as you're actual objective is to seize the Citadel! Second stage is protecting a Reaper comrade as it interfaces with the closed Citadel to get it to open for you so you can take control. The meatbags will throw everything at the hacking Reaper including dreadnaughts armed with thanix cannons. If enough are on him they'll destroy him and your mission will fail.
Reaper attacks: Fire main gun, fire secondary weapons, launch occuli (stun swarm attack) charge and grab.

Bonus mission: Destroyer's Revenge! Return to Tuchanka to get revenge on the worm that dared attack your kind! Use your superstructure to send resonant booms underground luring the mother of all thresher maws to you. Jump/dodge her pounce and fire your lazor at her. Different attack stages include sitting and spitting (like the maws do in the games), charging (the above explained dodging) and a final QTE event that kills her!

The enemies would be generic allied forces, unless there's a canon death of secondary characters we can depict. Reegar maybe?

Not bad. My intention is to have Harbinger included and all squadmates available even though a few could be dead. Earth offered that.

No

Have no interest in playing as a giant machine.

 If I was the one setting the price, I would most likely set the price at $4.99.

Another thing is that all squadmates don't have to be killed. They can be. A lot of the deaths can be allies that are seen fighting along side the squadmates

They did make a board game where one side would be Reapers and the other would be the Alliance or Cerberus.

No, but I'd buy a DLC that removed Reapers from ever existing

Already done