It's not about quantity, it's about quality. Things will likely get better, but right now, the app ecosystem is a big downside to this platform. Take a look at the "top free" lists for each platform:
Android
Windows Phone 8
Which one has the most fluff and garbage on those lists? Many apps show up on each list, but plenty are missing from WP8, and instead there are 3rd party knockoffs and lots of free wallpaper/ringtone fluff.
Where are the official apps from major sports leagues? MLS has one, but no NFL, MLB, or NHL?
Where are the streaming video apps? Crackle, Netflix, and Crunchyroll are all good, but where's Hulu, HBO Go, ABC/CBS/Fox/NBC, Xfinity, BBC iPlayer, WatchESPN, MLB.tv, or NHL Gamecenter?
Official banking apps, only a few so far. Official airline apps, ditto.
Also, how many of the apps are just placeholders? I still consider Yelp to be a missing app, because even though it is in the store, it has almost no features.
So this is a problem, and it does need to improve.