For me, beyond the pure stats that we know so well, even beyond the speed, is the distinct visual quality of it. You won't confuse MF with any other coaster on the planet. It's too distinct.
I think Dave said it best, MF looks more like Tex Avery than Ron Toomer. On side of the hill is 45 degrees. The other side is 80. It looks like something straight out of a cartoon! It's just exaggerated.
Even Steel Dragon, impressive as it is, looks like a standard roller coaster. And it is. It's basically just a scaled-up version of most hypers, which in turn were scaled of versions of the multi-loopers and wooden out and backs that came before. Magnum, for better or worse, was just like its antecedents.
MF is different. Yes, it's scaled up, but it's more. It's newer. It's distinct. It takes coasters into the absurd.
I'm not sure I can describe it any better.