It's... more complicated than that. Yeah, a meta analysis is only as good as its inputs. Unfortunately many meta analysises read like "we found 20 studies on t

It's... more complicated than that. Yeah, a meta analysis is only as good as its inputs. Unfortunately many meta analysises read like "we found 20 studies on the topic, but 19 of them are crap and the one good study didn't really ask the question we're asking, so we really don't know". And yeah, there's considerable wiggle room for a meta analysis. But I don't think you'll find any serious scientist doubting the usefulness of a meta analysis per se.