User blog comment:GeorgePowell/How do you think Mass Effect 3 will end?/@comment-2174252-20110704150312

By the snippets I’ve heard from Casey Hudson, Mac Walters and the rest, there will be many widely different endings. It’s not going to be just one epic paragon/renegade choice at the end, but you will be configuring the ending by choices you make along the way and from the very beginning. So, if you don’t like the end you get, you might have to go back to the second or third mission to change your choice.

As to how to defeat the Reapers, I opened a blog a few months ago to discuss this issue. There are many interesting theories and discussions there.

http://masseffect.wikia.com/wiki/User_blog:RayShepp654/How_to_defeat_the_Reapers_Theories