It's not like the price is going up and the battery time going down arbitrarily.
For those stoked about the 3D aspect, (the single biggest selling point of this system) that is the reason for the rise and fall of the price and battery time, respectively.
Not to mention there are THREE cameras, a richer internet experience (that we need to hear more about), Wifi, another level of wireless communication for StreetPass and multiplayer (an always-on drain on the battery, and I'm just assuming that they're the same radio), lots more software (DS emulation, AR, possible VC), AND better hardware.
It is well documented that Nintendo has gotten by with inferior hardware on their portables, much to the chagrin of certain people "hem hem". So now when they come as close to cutting edge as they have EVER done, people are bitching about the battery! What did you expect?
3 hours of 3D gaming/interneting/photography is pretty damn good.
Unless of course you can tell me about some other dual screen, portable 3D gaming/interneting/photo-taking device that lasts longer on a 1300mAH battery.
Edit: The only real competition Nintendo will have is when Apple releases the 3DiPhone and it can be bought on contract for $300. In the 3D world $300 is a very competitive price, and as I alluded to, there really isn't much else out there in the 3DSs class. Nintendo has done well with release date and price; before most other glasses-free devices, and a one-time price that is in the non-3D, cutting edge, mobile device, price range.