DC Rainmaker is a rather well-known name, which by itself precludes any possibility of his being "totally unbiased".

In any case his reviews are just that - reviews, sort of like extended advertisements, "reality shows" of product advertisement world. By nature, a review can't propely approximate the actual experience of owning the product. And regardless of which reviewed product one gets, one will invariably discover lots of issues not [dis]covered by the review.

Often, going back to his review of a product I personally own, I see in hindsight how his reivew was deliberately crafted to tiptoe around some problem present in the product. "Totally unbiased" is out of question here.