To say the app store is 75% crap misses the point in the same way as saying a library is full of crap or is full of irrelevant books. it is relevant to have it as a supplier of apps or books for when you need or want that specific book or app.
The candy store analogy is good also - you pay a few pennies and try it out - if you dont like it, hey it didnt cost much - unless you want to sample the iRa Pro for $900...
I think it is a phenomenal resource for fun, education and business. On a whim I got "Tips & Tricks" iPhone Secrets this week because I figured it looked interesting - and there are some things there I did not know the iPhone could do.
Had it been rubbish then hey, it was only $1 wasted. m If it came close to living up to the App Store blurb description then it is worth far more than $1. Thank fully it was worth it, but I would not have been heart broken if it was rubbish or even just not that great.
Just read the App Store descriptions and see if an app is right for you..