OTOH, it doesn't make sense that Liara would be on the Normandy if she was on Earth. The reaper strike would have made retrieving any survivors unlikely, and more unlikely still is the Normandy leaving the battlefield to go pick her up. This is something they could easily have remedied by picking a random squadmate that was free.
The problem I have with people complaining about this is that there are SO many plausible scenarios in which this could easily be explained.
But fret not, it has been officially stated that these holes shall be filled and so nobody will have to use their imaginations to fill them:
Mass Effect 3 Extended Cut | BioWare Blog
1) What was the actual effect of amassing war assets? Doesn't seem to have any impact on the ending, so does it make the running battle to the catalyst more or less of a slog? Like, you get fewer banshees if you have a higher rating?
Apparently the ending changes quite significantly but I've not experienced those endings and I've avoided the conversations about them. Your best bet to find out would be to go to the Bioware ME3 forums and ask there.
2) Do the various conversational options with The Illusive Man actually amount to anything? There were three or four, and I picked the paragon options until he finally commited suicide. Did you guys experience anything different?
I've heard vaguely that it does affect something about the ending, again, I don't know what though.
One thing about ME3 that was odd was the difficulty level compared to 1 & 2. I had to play on Hard to not blow through things with ease. Died PLENTY on hard!
Ironically the developers stated that they wanted to make "Normal" equal to the old versions of "Veteran" difficulty. Seems like the devs failed on delivering a lot of promises.
1) What class(es) did you play as?
ME1 I started as a soldier, primarily because I didn't know any better and I felt that it suited the character of "Shepard" the best. But due to falling in love with Liara, my Shepard developed biotic gifts with her training and... umm... their embracing of eternity together. Combined with the cybernetic implants and the change in his persona (he went 'dark' for a while), he became a Vanguard in ME2 (this was a decision made without the knowledge of the vanguard's uberness and popularity).
Since I enjoyed the vanguard so much and since I felt it had become an integral part of who the character was, ie. charge first, sort the bodies out later, I continued as one in ME3 and definitely wasn't disappointed.
2) Who was your most used squadmate?
EDI, by a long-shot. She's simply so useful. Between Incinerate and Overload, you essentially have the two most useful and powerful team-mate abilities in the game, all in one character. There were very few missions where I could justify taking anyone else in her place. Plus, I like her sense of humour.
3) Who was your least used squadmate?
Javik, again by a long-shot. He was useless and a whiny annoyance, always complaining about everything and telling me how good it used to be.
4) What was your favorite power that you unlocked from a squadate?
Energy Drain. It was the one weakness of the vanguard, ie. not having a shield drain.