Early reviews of the Kindle Fire are in the lukewarm category. The Android tablet from Amazon began arriving in homes this week and many are complaining about Wi-Fi issues, among others. Marco Arment, creator of the hit app Instapaper, cites a sluggish interface and unresponsive buttons: "Using the Fire is frustrating and unpleasant, and it feels like work." Others are complaining about its battery life and cluttered home screen. Sounds like the latest iPad killer is off to an inauspicious start, though at $199, the Fire is at least winning on price.