Weirdly enough, I think I'd rather dip back into Matrix 2 and 3 than BttF 2 and 3. The action sequences are mighty impressive, the aesthetics are great, and the dialogue - clunky though it is - does have a boatload of philosophy to chew on. I also like a lot of the concepts they put out. Club Hel, the Merovingian, the train man, the keymaker: these (and others) were all great ideas (albeit poorly executed ones). BttF 2-3 are fluffy, but not in a good way (to me, anyway). I agree that 2 was worse than 3, which I did kinda like. But that "chicken" subplot was...what was that...!? I did like 3, but I didn't really like part 2 at all.
I maintain that, if Matrix 1 didn't exist (or wasn't as awesome as it is) then No.2 and No.3 would be thought of as kinda funky, weird, decent action movies that bit off more than they could chew. But I think the sheer chaotic madness of them (there's wire-fu! and ghosts! and mecha! and squid robots!) would inspire a kind of Buckeroo Banzai cult following.
Just a theory, of course. We'll never know for sure because they will forever stand behind the brilliant candle that is Matrix 1.
I'll check out Summer Time Machine Blues. Thanks for the recommendation.