I have several reasons, and had a very hard time picking one of them (destroy) in my first playthrough w/ paragon maleshep that I've just only just finished.
A) Control - never in a million years would any of my Shepards even consider this. You spend the entire trilogy facing off against two main villains, Saren and TIM who both become agents of the Reapers. For all three games you're fighting a losing battle telling them both that they're wrong, Reaper control is a bad idea, and in the end they both commit suicide.
...yet at the end game of ME3 the starchild goes "oh, but you're special, you can do this!" and I just went WTF.

Synthesis - I considered this, it does render the cycle pointless, and ends it but with the death of Shepard so to me I'd only pick this if I was playing as a Shep that I didn't care much for and was just doing a test run.
C) Destroy - as I've mentioned I picked this for my paragon Maleshep, first playthrough which is kind of odd. The only things that made me do this were that 1) Shepard can survive, 2) the Geth were originally the enemy in ME1, but it is mega harsh to see them go along with EDI and 3) the Reapers are finally no more, with no responsibility from Shepard as in control/synthesis.
So, I really wish there was a fourth decision: what I actually wanted after being forced to pick one of starkid's own options was that Shepard should be able to give him a "**ck you" if their reputation is high enough, either way. Now she/he has independance, player agency. What I had hoped for ME3 was that the ending would be like that of ME1 on a much greater scale. Take out the control/power source for the Reaper(s), i.e. Starkid, like Saren w/ Sovereign, then you can defeat them by conventional ship v ship combat - will take a lot more effort, but without the needless death of billions and the reversal of loads of advancements i.e. mass relays.
Modifié par GuitarShredUK, 25 avril 2012 - 02:32 .