Given as we weren't given the option for better defined female voice actresses like Laura Bailey or Jennifer Hale, I suppose Sumalee Montano will have to get the job done.
She just comes across as slightly stronger and more self assured in her character acting that I'm familiar with from ME3 and from Saints Row 4, as compared to Alex Wilton Regan, who I am sure is quite good at what she does but doesn't fit my idea of what "I" would sound like in the given situation.
Overall it will come down to how the voice sounds with the face the character creator deigns to allow me to create. And regardless of all of that I'll still have horrible hair and will likely spend more time being concerned with that than I will with how the voice sounds.
Hundreds of talented hair mesh designers out there and none of them work at BioWare. Must be better money in staying independant I guess.