For these papers in particular, it seems like peer review was badly needed before publication. Sure, it's a meme that Reviewer 2 is always going to complain that could you please run like, 50 more experiments, and for something as potentially groundbreaking as room-temp superconductor, even more so.

But one of the main issues with the papers right now is their chemistry is deficient. The key chemical reactions don't balance, and there's also an unexpected and unexplained oxidation state change in the copper. This is the kind of issue that would be flagged quickly in peer review, and it's the sort of catastrophic paper issue that makes replication problematic--how can you be sure that you're comparing against what the original sample was?