of course they will include deathclaws

now this is what i call 'cool' 

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Well you are not comparing like with like at all :
Diablo 2 : great game but how many eons ago.
              It uses isometric view (not first or third person view) .
Zelda series : It was not a sand-box title at all to begin with. It was more of an adventure game than RPG like Final Fantasy.

I am sure plenty of games that can outstripped oblivion (like GTA 4) but regarding the genre (oblivion has no real clear competitor) like God of War which are still the the "king-pin" of action adventure game.

The closest game i can think of that (uses 1st & 3rd person view) that can match oblivion is Hellgate (do you have fun playing it ? ).

Definitely oblivion was not "perfect" but the high ranking bcos its like "one of a kind" feel.
There are couple of games that tries to imitate oblivion (like two worlds) failed considerably.