Most of what you see in Crysis is Speedtree, combat AI, and some good multipass rendering. The code is efficient. Good. But Crytek 'isn't' dealing with:
Handling both 1st and 3rd views
NPCs with routines
Time of day lighting
Complex interiors
Changeable armor/clothes and extensive inventory
Economics
Handheld weapons
Bows
Factions
Wildlife
Quests
Books
Complex spells with effects
...
And as far I know the best Gamebryo examples I've seen are the http://www.emergent.net/en/Multimedia/Videos/Coldwood-Tech/ and the http://www.emergent.net/en/Multimedia/Videos/Emerge-Video/.
those look very nice indeed Hel Borne. thanks for the link and small restoration of hope. although i was mostly amused by this video which showcases probably the two worst gamers i have ever seen. http://www.emergent.net/en/Multimedia/Videos/ZORSIS-Video/ if i was going in front of a shooting squad i would specifically ask for them.
as for the other things......most shooters have a third person view you just have to use the console to get it.
the spells in oblivion were nothing special, even two worlds had better looking spells than oblivion did.
oblivions hand to hand combat is very good....one of the things that they did better than morrowind. but ive seen better such as in dark messiah which runs on the source engine. which at this point it ancient.
there was more wildlife in crysis than in oblivion........if you swim in the water there are fish everywhere and they swim away from you if you get to close and birds are flying everywhere also.
oblivions AI consists of set schedules with wander packages, nothing special that i havents seen in other games. the vanilla economy is nonexistant....you have to mod that in. im however not going to defend crysis awful AI....even on the hard mods i was sniping people right next to eachother with no reaction, apparently bethesda wasnt the only one that had issues with realistic npc reaction.
im not sure what you meant by books and inventory system and quests since thats been in video games for decades. look at any old school rpg and they have even more elaborate systems than oblivion did.
and for time of day its been awhile since ive played crysis but i seem to remember the beginning of the game starting off at pre dawnish and then moving to sunrise and so on. its preset times for gameplay i think but you could see the changes in the angles of the shadows and stuff.