Well, obviously the ones from Guitarist (UK) where absolutely nothing ever scored less than 8/10 and you had to read so far between the lines to suss out the flaws that you often found not only another magazine, but sometimes Narnia. Because you don't want to piss off the advertising $$ that keep the magazine afloat, or the manufacturer/distributor who keeps you in gear to talk about.
In defence of YouTube reviewes, be they sponsored, paid for, borderline advertorial or whatever, at least with the medium you get to see and hear something of the product, and kind of see the presenter's method and approach, which all helps form a judgement on just how balanced, accurate, or in tune with your own tastes they are. Unless people are doing outright deceptive things (re-recording through different gear, massively messing with the EQ in post etc. etc.) then it's better than words on a page from a magazine where if it's shit they just won't cover it at all, because they can't afford to upset anyone.