"What if you were Shepard" ....
If I were Shepard the galaxy would be doomed for starters. I mean, really? If that universe existed and I was placed in her shoes my alcohol consumption would increase ten-fold.
The SR-1 team would have to carry me all the way through the hunt for Saren. Kaidan, Ashley, Liara, Tali, Garrus, Joker and Wrex would have my utmost respect and thanks.
The SR-2 team would have been much smaller since I would have never fired up the geth, released the krogan or kept Samara. I liked her but after failing her loyalty mission with Morinth ... I admit it, that chick really freaked me out ... I would have felt too guilty to hold Samara to her oath. As a result, I'm not sure how many of the teammates would make it through the Suicide mission but Jack, Zaeed and yours truly would have been running up some pretty big bar tabs. Miranda would not have been impressed and asked TIM if I were the real Shepard. My previous team would have laughed and just nodded.
During the actual reaper war I would be hanging on by a thread. Liara, Garrus and Chakwas would be watching me closely as they all three would know that my survival was pure luck. Yes, they had saved me a hundred times but even then ... Liara and Garrus would privately agree that I must have some god on my side. The diplomacy would be easy but the battles? Not so much. The one-on-one with the reaper? This is probably where I would have died ... but then again, my crew would realize that and it would have been Vega down there doing those dumb-butt rolls with that crappy thingermajig ... oh, and Sam would have had her bra & underwear removed zippedy-zap in that shower.
That's my story and I'm sticking to it.