There are currently 92,000 apps in the Windows store, and it's growing at an average rate of 591 apps per day. Using Apple's latest figures (from WWDC) for the iPad, the iPad appstore is growing at an average of 435 apps per day. This also includes some double counting for "free" and "paid" versions, which the Windows app store bundles into one app.
It's funny how you apparently think that shines a positive light on the situation.
The iOS App Store has existed how long? And how many apps are on it? If the Windows Apps store were doing well, at this early point in its existence you'd hope the number of apps would be increasing an order of magnitude faster than that.