@Lambda: excellent and insightful post!
As I've had the opportunity to play through more NES Maker games, I can somewhat see some of the general similarities between many of the early games. With that being said, I'd reckon a lot of folks are excited to get their ideas out on cart, to share with others. The initial games may be somewhat generic and average when placed on top of one another, but I'd imagine most of the guys making these games will use the support and encouragement to make each subsequent game even better, as knowledge grows.
Isn't this how things worked back in the "from scratch" camp though, so many years back?
It's the same situation with nes maker, with a new group of developers.
I'm personally excited to see what new comes out homebrew wise, it's exciting times we are going through!