gameplay. graphics are nice but i'd rather play an awesome game that looks ok than a mediocre game that looks amazing.
that being said, i loving love crysis, and a 15 year old game called mechwarrior 2
For example, FortressCraft is stuff.
fortresscraft looks like stuff because the graphics do not mesh together; it has an extremely blocky, simple world (like minecraft) but then it has a ton of shaders and high quality water that isn't blocky in the least.
if the people/person making fortresscraft took minecraft gameplay ideas and put it into a more unique format (ie actually DIGGING, red faction / celestial impact style, not removing 1m^3 blocks of dirt) it'd be a lot more interesting than minecraft, i'd say.