The first time ME3 trailer was revelaed.
ME2's arrival concluded with Shepard stopping the reapers return. They couldn't have simply 'walked' into our system without using a mass relay.... oh wait, they did. WTH?
I also thought it was utterly stupid that the reapers are still trying to harvest humans by only few millions a day while the devs mentioned this cycle is special. Reapers SHOULD have bombard earth from orbit and simply wipe humanity out before they try something funny.
I pointed that out on this forum, and got bombarded by fans back then. Little did I know that ME3 would turn into a whole disaster.
I felt the same thing when I started the game with Shepard being relieved from duty. I gave up all hopes at that point, so when DEM came up I was like "whatever..."