Yar lots of people prefer the female voice acting, personally I tried a bit but couldnt get into it, for me Shepard is MY male shepard with his randomly generated face from the first time I played ME1, I can't use another face now really.
For ME3 I just hope they don't go the whole DAO way with the "go do 4 totally independant missions to recruit race help and then come back to us" kind of scenario.
Or at least do it and weave it better than in DAO which, while good, always felt a bit flat in the personal involvement side.
From scenario point of view it makes sense Reapers go after Earth actually.
Major ME1/M2 spoilers below
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In ME2 it was quite pointed Reapers got interested in Humanity after seeing Shepard destroy Souvereign in ME1 since it's almsot the first time a lesser race managed to kill one Reaper before.
Then in ME2 you see they decided to start collecting humans since they think Humans are the "best" or "most compatible" lifeform currently in the galaxy to create new Reapers
Makes sense they would go straight for Earth once they come in full force in ME3
I just can't frikking wait for it... I managed to wait for ME2 to be on sales before buying it but don't think I can stop myself for ME3....