Great explanation, but I think you could improve it by putting it within the context of the hierarchy of evidence (i.e., how it should be weighted as evidence), and mentioning its flaws. Often in skeptic circles I saw people using meta-analyses as the nuclear option in arguments with alternative medicine supporters or such -- things got awkward when both sides had a meta-analysis in their favor.

Actually, I'm surprised someone hasn't made a post on how to weight research in general (that probably means someone has).