I, for myself, have learned not to base decisions on internet reviews. I mostly don't even watch them anymore. Honestly, most of them suck and they all start... let´s take a look at the lens, it has button for...blablabla for 10 mins... Things like "since it is pre-production model I wasn't allowed to take any images" --> admitting your review is totally worthless... or: "in conclusion, center sharpness is great, it is a tiny bit softer in the corners. at 100% crop" --> applies to almost every lens...
The only reviews I watch and like are such things "one year with..." or an actual comparisons of two lenses with lots pics.
I listen to people who actually shoot with the particular lenses (like several members here raving about the RF100-400mm, it was great advice), or I go out and try them (even I have to rent it). Sometimes, I wait to buy it for a used price which I can easily retrieve a couple months later in case I don't like the lens after all. The third option obviously requires funding, but in the end, it is a cheap option.
For the 50VCM, yeah, reviewers raise serious doubt about it... but it performed absolutely admirably those 5 days I rented it.