I recently picked up a 3DS and it is an absolute blast! AR cards are amazing, Face Raiders is a ton of fun, and the 3D photos are pretty cool. I am also playing some good old street fighter which is a ridiculously good port for those that played the console versions. Sure battery life sucks and the cameras take really poor quality pictures (3D is there but image quality is horrible) but the most annoying thing about the 3DS is the fact that the stylus is positioned at the top instead of the side.
The stylus was already positioned to the side for the DS lite so why would Nintendo move it to a far more inconvenient location? Perhaps the hardware design or battery pack was too large to squeeze a stylus in but it seems unlikely given that the 3DS had such a huge development time. I actually find myself using my fingers more just to avoid grabbing the stylus (from behind the screen – and you need to extend it once you pick it out). Really a small issue but an annoying one nonetheless.
Maybe Nintendo is just trolling and will reveal a “lite” 3DS with side stylus storage in a few months (some speculate the battery life was intentional so as to make room for future updates) but I doubt it.
TL;DR – 3DS = win but stylus storage at top = lose