I won't be.
I played Mass Effect 1 before 2 and I really didn't like ME1. I LOVE ME2, but the first game just wasn't there for me.
So, nope. I won't be playing them again. I beat Mass Effect 2 completely, and i'm going to play the new DLC for it today. Eventhough it was fun, I don't have enough time to play it all over again.