Genocide, noun - The systematic and planned extermination of an entire national, racial, political, or ethnic group.

I'd call the Ori a group under that definition (American Heritage Dictionary, as listed by http://dictionary.reference.com), so yeah, SG-1 (and the SGC) committed genocide. I think you're thinking of one step up, which would be xenocide, but that term doesn't actually exist according to dictionary.com.

Oh, I don't know about it being offensive to Ba'al, you know. Having millions of screaming fans wouldn't be a BAD thing for an evil overlord.::hides::