rabblerouser
Combustion Fucker
There's a much bigger factor there that you're not accounting for: your knowledge of what 'strain' is being sold to you. The placebo effect is massive - perhaps if you're sold "energetic" cannabis, you may be priming yourself for it to be energetic and act accordingly - you'll smoke/vape it when you plan to be moving around (or whatever) rather than imbibe and immediately lay back on the couch.
I'm not aware of any double-blind "sativa" vs. "indica" studies but that's a very clear and easy starting point - two samples with comparable cannabinoid profiles in the same setting (with a few days in between).
anecdotally I have given a friend Jack Herer and accidentally kept the kid up all night mind-racing. Not his usual reaction to cannabis. But, I showed up late at night and didn't want to fall asleep immediately. So, I packed Jack Herer, but didn't warn the kid what to expect...but you see the results
or the 'Green Crush' I picked up that I was hoping was really Green Crack. But, even though I was hoping for 'sharp energy' from the description on the website, it was really more somewhat sativa-leaning hybrid than sativa. (The dispensary has since amended the description to be more accurate and not be a ripoff of the Green Crack description).
Still, yeah 'double-blind' would be great and some sort of indica vs sativa could be a good starting idea. Or specifically for myrcene the best I can come up with off the top of my head would even be 2 cuts of the same strain, both fairly similar chemotypes, just noticeably more myrcene in one than the other. But that may be a hard example to contrive.
I still think it is more about ratios of things and synergies ( 'entourage' ) than absolute amounts / percentages, but I don't know that there is any science backing that up.
But, I think strain reviews are still useful, until the science catches up.
Some of my favourite reviews are the ones by growers of the different individual seeds they grew out for one strain. gives an idea of how the spectrum of possible phenotypes / effects can play out. Any one (or more) of which they could pick to be their mother plant. And then everyone who samples it will only experience the one he selected as a winner.