It's been done before, all I actualy suggest is that destructable environment was badly coded and instead of indestructable elements being ground level - the function of hard limit for "noclip" falls on the sprites, in this case - bush or tall grass is somehow coded as indestructable element. Which, to be fair, no one would give monkeys about - it's just some tree falling and levitating above ground or dead enemy body ragdolling in convulsions submerged half way through the floor - it is still very enjoyable, if a little slow, game - if it wasn't for the fact every reviewer wet their pants calling it the benchmark for realism or even, what was it "the world of games will be known as world before cysis and after crysis". That's simply far from what Crysis is at the moment.
Actually I can't see what this game has done in terms of graphics to run so bad. The forests and jungles are not that much better looking to be as slow as they are compared to games already out, the water and environmental effects again don't look good enough to justify performance hit of that scale. And so doesn't mapping to justify massive leaks and broken textures all over the place. The way I see it - given existing technology and the fact DX10 should run faster, this game in medium settings should give you at least smoothness of FarCry on highest settings, HDR and shaders at HL2 Lost Coast levels and dynamic shadows of FEAR proportions. In other words - it should be perfectly playable, and setting it higher would add the whole "moving leafs", "motion blur" and "thick vegetation waves with the wind" element. Otherwise, truelly, do all these jagged edges, 15 frames per second and soft focus/ weird too bright patches in the sky telematic 1980ies VHS camera lighting deserve anything more than over the top, too ambitious for hardware abilities games, such as ArmA?
In terms of realism my view is similar - it's not a bad game, I just feel it should be pointed out - you will have fun moment or two driving into that hut and shooting the tyre, but few disassembled flat pack housings later you will notice the realism, compared to other games on the market already, or even its predecessor - FarCry, actually blows. And so does AI. It's the kind of AI that can see you in thickest of bushes on highest of mountains, but when shot they creep sideways around village looking confused and shouting to each other in broken English and then 30 seconds later forget all about you, their dead buddies vanishing from the ground in front of their eyes and go back to looking daft at pretty tomato patch. The AI that will call for helicopter support alarmed by you hidden behind tree two miles from the village but not regrouping around main entrance to await your approach. And once again - stupid bots are excusable, if it wasn't for the fact we read so much about benchmark intelligence of those bots. It's not that Crysis is bad, it's just that it's not as good as those raving reviews make it out to be.