It always worked well for me. I actually never used Google/Bing/Yahoo to search from an iOS app
This is the core of the issue right here. You know, I wouldn't doubt that Google just might very well be putting their results ahead of the competitions. It's a little low. A little sleazy.
...a little pointless.
Why? Because chances are good you're going to be searching for your apps through the App Store. Or if not there, you're going to be looking for "best writing app for iPad", which takes you to the appropriate links with nary a Google Play result to be found.
I know a lot of people here like to pull out the dumb consumer excuse as a reason why this is bad, but I doubt people are so idiotic they don't know the name of the device they just spent $350+ for.