There's confusion here between two completely different things: meta-analyses in research and meta tags in SEO. Meta-analyses are systematic reviews that combine data from multiple studies to draw stronger conclusions. They're reliable when the underlying studies are sound and the methodology is rigorous, but this has nothing to do with on-page SEO. In SEO, meta tags are HTML elements that provide information about your page. The meta description shows up in search snippets and influences click-through rate, but Google confirmed years ago it's not a ranking signal. The meta keywords tag has been ignored since 2009. The only meta tag that directly affects rankings is the meta robots tag, which controls indexing and crawling—mess that up and your page won't rank at all because it won't be in the index. At Ottawa SEO, we focus meta tag effort where it matters. We write meta descriptions for every important page because a 0.5% CTR improvement on a page getting 10,000 impressions monthly means 50 extra visits. That compounds across a 500-page site. We use 145-155 characters to avoid truncation, include the primary keyword naturally, and add a clear value proposition or call to action. Meta robots gets careful attention. We use noindex on thin pages like thank-you pages, pagination beyond page one, and filtered product views to avoid indexing low-value variants. We use nofollow sparingly, mostly for user-generated content sections where we can't vouch for outbound links. The reliability question matters more for title tags, which are meta elements and do heavily influence rankings. Google rewrites about 60% of titles now, but when your original title is specific, includes the target keyword near the front, and stays under 60 characters, it usually sticks. We've seen 15-25% ranking improvements from title tag optimization alone on pages that were previously generic. The bottom line: meta tags are reliable tools when you understand what each one actually does. They won't fix bad content, but they're part of the technical foundation that lets good content perform.