Hmm, i really don't have a problem with the the way ME3 ended, there as we all know 3 ways of endning the game, and in my opinion, the Renegade solution paves the way for a continuation ;-) ...
Just hope the team have the same thought :-D ... in other words, you wouldn't tell Steven King or some other favorite writer to rewrite their respective work, just because something in the book isn't the way you read was in your interest of what it should or could have been ;-)
There was also a very good explanation of why the story ended as it did, Indoctrination! ... play the series all over again and pay extra attention to the story rather than the gameplay and it all makes sense ;-) ... that's just my personal opinion.
However, i am a dedicated fan of the series as a whole, books comics and games .. i mean WOW!!
Reading Revelation novel, playing Mass effect 1, then read Ascension, then play Mass effec 2, then read Retribution and now playing Mass effect 3 ... the story in it self has some plotholes and flaws, but it's a damn good experience when you go into the depth of the story as a whole, and can only be recommended!!! you won't regret it, and im sure you all will see the end of mass effect 3 in another light ;-)