FYI, it does have 3G. There is a Wifi only model, and a 3G one. You can get an unlimited data plan for it for for $30 / month, or $15 / month for 250 MB.
I'm not really sold on it myself (and I own an iPhone and am typing this on a MacBook). With that said, some of the major complaints may end up being a bit off the mark. For example...
"No multitasking" isn't quite true. Even the iPhone can multitask, but Apple has created an OS that will not run two 3rd party apps at once. I would be willing to bet that with Apple providing major apps like email, browser and iWork suite, app switching will not be that bad. Although certainly worth keeping an eye on, just realize that the whole multitasking thing is an Apple design thing, not a limitation of the machine.
Although there is no Flash browser plugin, Adobe has already created a packager that builds apps for the iPhone. So many Flash games will be appearing on iPhone / iPad, they just won't be in your browser. Also since iPad only runs Safari, that means it will be supporting the latest browser technologies such as SVG and HTML 5 sooner than later.
It's pretty funny how the ridiculous amount of hype for this thing has flopped back the other way when it didn't instantly bring world peace. I bet it ends up somewhere in between =)