I have to sincerely disagree.
I've been playing d20 products since they have come out and there is significant differences between products.
Tone, Atmosphere, Adventure Types, Character abilities varying widely from:
DND
Star Wars
Spycraft
CofC d20
Arcana Unearthed
d20 Modern
Mutants and Masterminds
Macho Women with Guns
If they were all basically the same there would be no need to produce a core book for each of these settings.
So I'll sit here hoping someone at Mongoose will heed my plea for a fastplay rules or "Armaggedon:First Skirmish"