I actually just noticed that my switch tester has two Razer green switches produced by Kailh. They both feel a bit different from each other, to be sure ... and so do the Cherry MX blues on the same tester. They seem to be to be roughly the same in unpleasant plastic rattle, etc. My sample size is small though. I already hated Razer by the time I had even heard they were making mechanicals, so I never did bother trying one of their boards.
I wonder if this is an inherent weakness of the MX design which relies on a metal leaf within the housing. It's generally not an issue I've noticed on MX boards though, it was only really on that Razer where it was so bad I was wondering if it was broken and that the QC process wasn't very good.
I think so, for the most part. Gaterons and Outemus always seemed to me to be the best of the bunch of the MX extended family that I have tried, though even the Gaterons aren't perfect in that regard, and the Outemus are definitely a slight step down from there. The only somewhat common MX clones I have found to feel and sound noticeably worse than the real MX blues were the cheap Zorro/Ajazz switches, which seem to most commonly sound and feel like you've just dropped a glass marble onto concrete and that it has bounced a few times.
For me, even after typing on an Outemu blue board for just a few minutes, I already start missing Alps, capacitive buckling spring, Matias, and box thick clicks. I think that at this point, even being a clicky guy, I may prefer some of the nicer tactiles, like Topre, or some of the nicer linears, like Gateron yellow, to MX blue. I know I can certainly type with alternatives such as those for extended periods without so abruptly asking myself why.
Sadly, I can't say that that's because I particularly like those switches so much as it is because I now particularly dislike MX blues, and it seems like they're a weak link even within the original MX family (browns aside).