It's pretty slimy, but par for the course in all walks of "journalism" that involves products. Car reviewers are often given serious discounts on that car, cellphone reviewers get the phones, game reviewers get copies of the game or related swag like consoles or in this case, tablets. Movie reviewers get copies of the movie, sometimes even a big flatscreen TV. People who review golf gear for golf sites and magazines, get some really expensive tech as "gifts" too.
I cannot think of a single industry that involves reviewing something, where press isn't likely to get some form of "swag" or fringe benefit. Heck, even just being a radio DJ gets you wined and dined, to make sure you play the label's newest hit as much as possible.
It'd be a bit naive to act like this is a problem exclusive to games journalism, or even that it's worse in gaming than it is in other industries. Doesn't make it right, though - but as long as "marketing" works, PR agencies will use any and all avenues to try and signal boost their represented products. Not all gaming journalism is just an arm of marketing, every publication / site has their own policies. It's a matter of readers understanding which ones do what, and deciding who to follow.
This includes e-celebrities on YouTube and Twitch who do let's plays or game streams. Those people aren't immune to this kind of PR meddling either.
PR is industry politics, and it only takes three people to create politics: two with opposing views, and one to convince.