I have a hard time taking these criticisms seriously. Resolution, yeah I'm pretty miffed. But 'mediocre looking'? Has everyone's standards really shifted that quickly? The exterior shots of Paris look amazing. And judging from the improvement we saw from AC1 to AC4 on last-gen hardware (in fact the jump from 1 to 2 was amazing), this is just the beginning.
Not sure what you guys are looking at but this is pretty impressive, to me.