i think SMG2 is built on the same engine as 1 therefore gameplay (which is the thing that matters the most) can't get worse, only better or the same
from a design standpoint i think it looks like it'll be much more creative and filled with new ideas, i feel it will surpass it in that regard for sure
however, i don't think it'll surpass SMG1's score of 97 metacritic, it's hard enough to do that for normal games, but sequels with not much graphical improvement? i don't think so. reviewers might say it's awsome ..etc BUT they'll claim nothing has changed since the first even though the sequel seems to be MUCH more creative and more filled with cool designs and ideas
just what i think, don't take it too seriously :p