Where are gobs of Science Fiction for lower MG readers?

Recently, I tried to get a small discussion going on Verla Kay’s blueboards, concerning what I see as a lack of sufficient SciFi for lower MG readers. Yes, others quickly replied with books/series that fit this category, but it wasn’t an avalanche of suggestions.

What we did agree on, in the end (sort of), was that serious fantasy and science fiction are weakly represented in the lower MG arena. At least, that’s what I took away from the discussions.

So I ask you, dear readers, to agree or disagree with this assessment. Do we need more serious fantasy and science fiction for the lower end of Middle Grade? Or, are these genres well enough represented?

I truly wish to hear your responses.

Nuff said!