Couple of things.
1. Speaking literally for a second, this isn't advertorial. Advertorial means that they were paid by that company to write it.
2. They are called press releases for a reason. Press is the main way to spread the word about something. How is a gaming website supposed to know what's going on if they don't get press releases? Go to another gaming web... wait no... they wouldn't have the press release either. If this was valve putting out a press release announcing Half Life 3, no one here would really be flipping out to the same degree. Just because it's, god forbid, a pizza restaurant, everyone's up in arms.
3. All this being said, I do think it's pathetic and lazy to just ctrl+c a press release and call it a day. It's lazy and reflects poorly to your readership. Entertainment is one of the key elements of a gaming website, and if I can just go anywhere to get a copypasta press release, then there's no point in going to THAT one. "Press Restart" indeed.
4. Unless there's actual offensive content, like racism or sexism, or any other type of insults, there's NEVER any reason to shut down a comments section. Even if the comments are unreasonable and mob like, it's still a huge pile of disrespect to shut down the conversation. Conversations are the main reason that web 2.0 exists, and shutting that down is missing the point.