Re: Too little, no credibility, too expensive
Actually more like XBox. That's where much of the design language originated after all. And yes XBox took several years to overcome firmly established opposition amidst all sorts of cries of there aren't any games, no-one will lead with XBox, etc. etc.
Microsoft has a track record of being late to a particular market and then crunching the opposition over years by spending big bucks. Only time will tell whether they can pull it off again.
Personally I like Windows Phone 8 and Windows 8 and have both. The phone and tablet work better for me than other devices I had previously, but then I make heavy use of Office, especially OneNote and spend lots of time with Windows Server (having touch via RDP to a Windows Server 2012 VM in the cloud is just neat). Integration to work Exchange and SharePoint servers and SkyDrive work very well for me and I haven't found a scenario where I needed an app I couldn't find, but then I use LinkedIn and Twitter and not Tumblr or Instagram.
People in the Linux/android/iOS worlds will continue to spew hatred and vitriol and proclaim doom and gloom and moan how bad Microsoft are whilst not using their products. Maybe one day they will grow up and learn how to debate on facts. Using FUD against Microsoft doesn't work, they are the 800lb gorilla and there are thousands of people making a very good living utilising Microsoft technology to very good effect.