..."Quantum Mechanics and General Relativity and String Theory. These theories may have had merit at some point..." Is QM without merit now? Seriously, is this

..."Quantum Mechanics and General Relativity and String Theory. These theories may have had merit at some point..." Is QM without merit now? Seriously, is this a meaning of the word "merit" I'm not familiar with? I do sometimes trip over American and British differences. As far as I can tell, this is a crank site promoting a pet theory, and should be trusted as far as one expects.