Really? Cause I remember my GTX 570 not being able to handle anything above medium/high in Crysis 2.. And a 680 can run about the same, med/high at a steady 60fps in Crysis 3. And it's just the way games work, requirements keep going up every year.. And if you want better performance, try turning down your AA, its a real killer
I didn't think Crysis 2 looked great at all (didn't look bad but nothing massive compared to 1) but I have not seem 3 so cannot compare.
Crysis 3 does look significantly better than Crysis 3 on Very High imo (the equivalent of Ultra on Crysis 2, they "normalized" the texture levels, i.e. low, med, high, very high rather than high, very high, extreme, ultra).