I don't think it has a PR problem. Outside of the very IT-focused environments the press coverage I've seen has been exceptionally positive and particularly of the Metro UI. I think occasionally IT folks get a little over caught up in the echo chamber we've created and how it over amplifies opinions that are particularly extreme in one way or the other.
Andy I mean no disrespect but I can't find much coverage that is exceptionally positive and particularly of the Metro UI. What do find are a lot of neutral reviews of Windows 8 that raise a lot of questions. I'm a news junky and read and watch more than my fair share of news in and out of the technical realm. In fact my favorite magazine to read in the WC is Oprah's "O" magazine (really helps you understand the female being better). I'm not saying I qualify as scientific evidence to the contrary of your point but am scratching my head here wondering how you came upon yours.
The only enthusiastic reports I've read were from device manufacturers looking forward to building Apollo (W8) based devices. While that's some good news it doesn't equate to WP's (or W8) success in the marketplace.