A character is always senior to me as a reason to go to a place, so picking up our new character on Omega is fine with me.
As far as hub world technicalities, I understand that. And I also understand that there are only 2 places developed in extent in the MEU besides the Citadel, and those are Omega and Illium. Having said that, we'll have gone to each 3 times I think, and spent more time on each trip to each than any one place we've been besides Duellos. It's just a tad dull to me when I think of an MEU that is supposed to be rich in locations, and environments, and you know...we don't have to suffer from the limitations of a video game to only come up with certain locations.
Still, i'll always defer to taking on a new character and if they are on Omega, then fine. I'll just have you know I was all eager to come up with the reason an asari maiden might be found prisoner on the Medusa, since there already is a reason built into the story....