My opinion was that ME3 is going to turn out somewhat similar to Dragon Age: Origins (I know no one's going to like me comparing the two games), in that Shepard will have to forge alliances with as many races/factions of aliens that he/she can to take down the Reapers. I doubt it will come down to picking between Geth/Quarians, Krogan/Rachni, etc. like Dragon Age, but I see a resemblance in the building of a great army to stop this great force. I get the feeling that if this is the case, then we'll see our ME2 crew again in ME3 possibly helping us forge alliances:
Mordin and Captain Kirrahe (Salarian Special Forces)
Garrus (Turians)
Tali (Quarians)
Legion (Geth)
Wrex/Grunt (Krogan)
Liara and Samara (Asari, Asari Commandos and Justicars)
Ashley/Kaiden (Alliance)
ME1 Rachni Queen choice (Rachni)
ME2 endgame choice (Humans - Alliance/Cerberus)
...just to name a few.
There's no way Shepard + Normandy crew fights the Reapers solo - it
has to be a galaxy-wide effort. Unless Shepard is really
The One 