Yeah, lots of inconsistencies and plot holes all around. You would think they forgot alien races existed while making ME3. Since most other alien races are missing, or just barely there, C-Sec or civilian. I mean, where are all the Krogans? Were they banned from Citadel after ME2? Where are all the Elcors, Drells? No Quarian on pilgrimage? Are they not doing that anymore? Not to mention, where are all the Keepers!!! I mean, in ME1 and ME2 you couldn't walk around 5 steps without hitting one of these guys. Where did all of them go?
On another matter, I never understood why we couldn't visit Citadel locations from ME1 and ME2 in ME3.. (same goes with locations from ME1 in ME2) Only exception to this, at one point you get to visit Council chambers to chat with Citadel Council members, but even that is just a cutscene (you can't walk around at all) and isn't the actual map, just a screenshot of the map placed behind the Citadel Council members. I mean, there is absolutely no reason why this should happen.
This probably can't be fixed without moving all three games into a different engine (I am not going to say that will never happen, but it is very improbable if not impossible), but still, it is worth mentioning while we are on the subject of ME3 nonsense..
(On that subject though, have you seen this?)https://www.youtube.com/watch?v=rbeVoxsqGfQ
(Sorry if I am littering your thread, not my intention.)