I will agree this is an annoyance, but I will still maintain that the Air is by far the best tablet ever made. I can get a lot more productive internet research/work done on this tablet than any iPad prior.
Also I suspect about 50% of the problem is iOS 7 and I'm hoping for improvement in 7.1. I realize that 1 GB of RAM is 1 GB of RAM, but I notice memory inefficiencies and bugs in iOS 7. For example, after a hard reboot my Safari reloadings aren't nearly as bad as they get after many days without reboot. Memory usage efficiency is one of those things that seems like it always needs to be fine-tuned over a series of patches after a new OS is released. I think Apple is working on it.
In any case, the Air still rocks, and damn is it fast.
It's not the end of the world, but for some use-cases it would be a deal-breaker. If you're filling a form, and switch to (say) Mail to do something, and go back to safari to find the form re-loading and blank... I'd just give up and use a laptop.
If they could just save the form data when the page is being purged and re-populate when it reloads it would be almost a non-issue, given how fast the Air is.
And yeah, it's incredibly fast. Not sure why, but for browsing it's faster than my i7 MBP, many pages load with no noticeable delay at all. And the gaming experience is very nice.