No. It's time to teach you what words mean in the English language:
Fact: A fact (derived from the Latin factum, see below) is something that has really occurred or is actually the case (http://en.wikipedia....rg/wiki/Fact).
Opinion: [A]n opinion is a judgment, viewpoint, or statement about matters commonly considered to be subjective, i.e. based on that which is less than absolutely certain, and is the result of emotion or interpretation of facts. What distinguishes fact from opinion is that facts are verifiable, i.e. can be objectively proven to have occurred. An example is: "America was involved in the Vietnam War" versus "America was right to get involved in the Vietnam War" (http://en.wikipedia.org/wiki/Opinion).
A statement about how Mass Effect was actually marketed is not a statement of opinion, it is a statement of fact. The presence or absence of proof does not make something go from an opinion to a fact.
I'm sorry to butt in, but you're not entirely correct. It's not a matter of the difference between fact and opinion (and I think coldflame was also wrong to call it that). What you are actually doing is making a
claim. And unlike facts, claims do require proof. Because even if
you know it to be true, the rest of us may not. For all we know you may be wrong, or, as you said, lying.
As for the topic, I prefer voiced. In DAO I often took to actually reading my Warden's lines out loud, just so she'd have some expression of personality.