Because:
- Some advanced HTTP requests can't made via WCF (like `Get-AzureWebsiteLog -Tail`) I've confirmed that with Suwat
- WCF is unfriendly with [PCL](http://msdn.microsoft.com/en-us/library/vstudio/gg597391%28v=vs.100%29.aspx) which `HttpClient` has good support there.
- `HttpClient` is more easier to tweak if I want to make parsing with different format.In WCF if you used something different than XML, u will do lot of work to achieve it.