I'll ignore the downloading games part because it's irrelevant to the question. Scrubbed game sizes vary greatly based on the amount of data game game actually uses. Some are tiny as you saw with NSMB, some can take up almost the whole disc and be over 4GB, and there are a few dual layer discs that are pretty big...Like SSBB is roughly about 7GB or so if my memory serves me correct. Game sizes are all over the place. There is a thread on here somewhere if you use the search that will give you some examples of scrubbed game sizes.