Well, since we haven't seen MOS yet, it could well have Sci-Fi elements in it, considering that Goyer already said they'll try to be as 'real as possible'... so, yeah, in that regard, it may be consider a sub-sci-fi genre... but definitely not pure sci-fi....
Cause, just because you explain such and such does not make it 'sci-fi'.. it has to start with a technology, or knowlege we know as true, then postulate it to some fantastic future / extreme which is also plausible.. for instance, just saying 'the yellow sun affects this alien being' is not sci-fi...
but saying 'these aliens have denser cell structures and strong muscles because they evolved in a far bigger planet', now that's sci-fi...
And no, 'ability to fly' just because you're from a denser planet is not 'sci-fi' no matter how they try to explain it... (the closest they can come to trying to make it as sci-fi-ish as possible is if they said that since superman's cells are denser, he can somehow control their 'density' or manipulate space/time around him, and cause an anti-grav field... and that's why we see pebbles floating just before he flew for the first time in the trailers... , now, that's sort of a cop-out sci-fi-ish.. like warp drive in star trek for instance...)
Again, still fantasy... totally baseless.. midiclorins or whatever they say it is is pure fantasy...
I don't watch Doctor Who, but if it deals with time machines, etc.. then those are all plausible...
Just because an 'actor' says it is doens't make it so... even if George Lucas says it is, also does not make it so...