I've been firm in my decision not to buy ME 3 ever since they announced BF 3 would be Origin exclusive. That's when I faced the fact that ME 3 would be Origin exclusive, and since I was already on the fence because of the lame aftertaste ME 2 left with me, Origin pushed me over the edge to "not buy."
The best part, is that in the 4-5 months since I made the decision, everything EA has released about the game has made me happier with my choice.
The first Mass Effect felt like an attempt to recreate the appeal of KoTOR without using the star wars license. One of the coolest parts of that game is *minor KoTOR spoiler* when Bastilla and the player character go to the ancient temple on Dantooine and get some revelations about the star forge and what Revan and Malak are up to. I got a similar feeling while playing ME 1, as they revealed the deep galactic history of the protheans, reapers, citadel, etc.
I don't really care that ME 2 turned the series from an "RPG" into a shooter, my problem is that they moved from scifi to mainstream blockbuster action. This latest trailer for ME 3 completes that arc, by showing us an earth full of present day / near future imagery, and all the usual blockbuster puke like spaceships shooting explosion beams into skyscrapers.