SO! Really, the main problem is the battery life, but when I was reading a comparison article at Kotaku I noticed something...
"• Battery Life
Nintendo DSi: The lowest brightness (9-14 hrs), low brightness (8-12 hours), medium brightness (6-9 hours), high brightness (4-6 hours), highest brightness(3-4 hours)
Nintendo DS Lite: The lowest brightness (15-19 hrs), low brightness (10-15 hours), high brightness (7-11 hours), highest brightness(5-8 hours)"
If you look closely, you'll realize that the DSi has MORE brightness options. So I came to a couple of conclusions. What if they just added a brighter light and the "normal" setting on the DSi was more like the DSlite's high brightness setting? That wouldn't be much of a drop at all. Actually, I know that's most likely not the case. However, the fact remains that there's an extra brightness option which could mean any number of things.
Who plays their DS at full brightness anyway!? I turn mine down to a very low setting most of the time. I think the battery issue is pretty ridiculous, especially when you compare it to all the other new features that Nintendo is including. I still charge my DS about once a day, even if it's not almost empty, just to make sure that it doesn't run out. I also, generally, don't play it outside of my dorm or my house (or anywhere with an outlet) for more than a couple of hours, so I don't think that having my DS die on me will be something I run into often if ever. I'm sure I'll be able to muscle through with the DSi. I don't see the point in complaining about a new model of an already existing console, especially if you're not going to buy it.