That's funny, my iPad Air works almost perfectly. Moving in and out of apps is fluid, and I have yet to run an app that causes problems on it. I say "almost" because of the Safari tab reloads. Depending on what other apps are open, it's been as bad as only 3 tabs before they reload. Still, everything else I throw at the iPad, it does very well. Why get so worked up over one thing? Life is too short to focus on the negative aspects of something when the positives are overwhelming.
The post you quoted implies nothing about being "grateful for it". The writer of that post is merely saying that Apple isn't going to go out of their way to cater to people with very specific wants and needs. It will make products that provide the majority of users with a smooth and solid experience. Apple simply won't cover every usage scenario; those who have needs that Apple doesn't currently provide for should look elsewhere.
In summary, we have options. Nobody is forced to buy Apple products, therefore it's counterproductive to get upset about Apple's decisions. Criticism is one thing, but so many people here on the MacRumors forums can't seem to criticize Apple without getting worked up and full of hyperbole.
"Very specific needs"? I could see flash being a specific need for a tablet, but most of those are just good ideas in general. Also, the fun part was when he said he hoped that Apple told them to "get bent". Because being rude is definitely the hallmark of a good point.