Because they're almost all either remakes of older, better sets (or rather, remakes of the remakes of those sets) or Clone Wars sets with garishly stylized minifigures. Lego has absolutely nowhere to go with the line, and they probably should have just let the license expire in '07.
I have no interest in the Clone Wars sets, but I was thinking, here's a question for you: What makes the new Star Wars sets terrible. I don't buy them, but I don't mind them either.
And @ everyone complaining about decals, personally, I'll take decals over printed pieces any day, since, you know, you don't have to use them. Meaning that you can reuse the parts for more things without having to brasso their designs off.