I liked my DS Lite but I like my DSi better. The GBA games are pretty much gone now. I know people still play them. I've been known to play mine every once in awhile but they aren't making any new games for them anymore. So if you already have every game you wanted then there's no point in playing them. Personally I prefer my ds games. Soon the GBA games are going to be completely gone in most stores.
I love the DSi's cameras. They are alot of fun and take decent pictures. The DS lite and the DSi play pretty much the same games so you can't really compare their games. Most of the downloads for the DSi do suck but they are slowly getting better. Besides would you rather have a DS that's downloadable only like the PSP Go?? I think there'd be alot more complaints about that.