Murph
Senior Member (Voting Rights)
I fear that maybe mendelian randomisation studies suck because it is cheap to do. You don't need any samples or pipettes, microscopes or a lab. You need nothing more than a database and a copy of some free stats software. Barriers to entry are low and so, even though the technique can be incredible when done right, in practice it attracts people with no real background in what they are looking at, nor plans to take their study further.