EA DICE has the title for the worst stories.. for all of their games with em
Especially in the last 3 BFs.
But either never played GoW so can't tell you on that front. But it cannot be worse then DICE's Bad Company crew as well as Battlefield 3 campaigns.
COD is also failing in the story department as well since COD4 which was honestly the last decent SP campaign they have had.
Of course all these titles have one thing similar they are all shooters. And unlike the rare ones like Duex ex; shooters especially ones that are focused on MP as much if not more fail in the terms of story. I am fine with because no matter what campaign it has it only lasts 6 hours MP is where the longevity of that certain game is. Having backstories per map like the older Battlefields games had were nice but you do not need more then that if its MP shooter.
Either you only plays games like Torment, or you're blowing air out of your ass. If you're expecting some extremely deep writing, you should really consider reading the books in TES, and realize the game is an open world RPG, not some giant political and character driven single players RPG. Even still, there are VASTLY worse games, in terms of writing and narrative.
Is it the worst? no but Skyrim has no conclusion more so then Oblivion did or previous titles. Kill big bad dragon yet smaller big bad dragons keep appearing forever while in Oblivion you shut the gates of Oblivion then send Big Bad Stompy DEVIL MAN!! back to Oblivion and your actions have made an affect on the world a Statue in your honor as well Tiber Septim resting place in the Imperial city. Lacks in other areas as well. Yes it's not a linear game but do praise it as if it could not better BGS lacked in that aspect of story replaced with "dynamic" quests.