I love promoting my level 20 MP characters. With the Multiplayer challenge, it gives me more reason to promote them and go back to level 1 and promote more MP members to become single player asset. My goal is have enough MP level 20 characters promoted to create a very high ratio of readiness that they can technically "jump" to almost the end of the story because they already have enough firepower to fight. (Maybe Bioware can consider releasing a patch that allows the entire fleet to jump to almost the end of the game to start the final battle if the player has certain level of promoted MP characters.)
The video above is quite funny but in one of my playthroughs, almost all the crewmates are dead with exception of a few that cannot die which means the "alternate" video cannot happen or extremely short, and probably few will try to remember Shepard in the end because it was stupid luck that saved the people.
Edited by Vortex3D - 8/22/12 at 8:45pm