I'd say you need an older game for comparison. All the games suggested right now are really similar, including the ones you have. I know, I know, people are going to say that there's worlds between half-life and mass effect, but their really isn't.
What I'd suggest is to just pick three completely different games, and examine how they tell their story, as much as the story they tell.
Fatal hearts is practically an interactive book, and a very interactive one at that. You read a lot, and most of the time all you do is pick dialogue options, with a few really nice relaxing puzzles in between, the story however is very deep, with 14 or so different endings, tons of different ways to get there, and a huge cast. It's an amazing game really. It could serve as a nice example.
Then you could take Baldurs gate, Planescape: Torment, Neverwinter nights, KotoR or whatever, the first one's are better, but it's the same general principle, much of the story is told through your companions, and which companions you pick is entirely up to you, in the good ones in this type of game you also have a lot of choice of how to proceed in the story and how to develop your own character.
Then you could go with Stronghold, Age of Empires, or another strategy game that tells the story of a nation, or on a bigger scale. Most of the time the important characters aren't present in the actual gameplay, you will hear a lot about the Snake, or the Wolf, and you will see them speak, but never directly interact with them, which provides an interesting alternative to the other games. You could also compare this to Starcraft, Warcraft or Age of Empires 3, where the special characters are present in the game, where they actually directly interact.
These would provide a lot more perspective on storytelling in Videogames, rather than storytelling in recent first person shooters with some rpg elements, which is what you've been suggested before. Using Half-life 2, Mass effect and Bioschock (or even Deus ex or system schock) is very limiting to how stories are portrayed in the medium. They are great examples, but they would limit perspective, since the goal of your article is to showcase storytelling and it's evolution in video games, you shouldn't limit yourself.
When thinking about it, adding in something like the Thief series or Mafia, a chronicle of the main character, told afterwards would provide another interesting perspective. In Thief you get Gareth reading from a diary between missions, explaining his reasoning and motives, what is happening in the current politics in the world, and in Mafia you see the main skip over long passages, because they aren't relevant to the story.
