Okay article, just poorly written at times. It definitely seems to have been written for folks who have less knowledge about gaming in general, instead of those who typically read about games online.
"Why didn't you include X game" is always going to be part of the commentary of lists such as this, especially if you put "Best" or "Worst" in the title, and you should be prepared for those comments going in, and even encourage them. Maybe have a "see also" bit for others in a similar vein.
The commentary on League of Legends is fairly well off the mark. It's only massively multiplayer to the same degree as Team Fortress or Starcraft. Even just calling something that came out in 2009 a "fairly new game" doesn't feel right, especially when the other games in the list are mostly significantly newer. We really don't need the individual game jargon either, like "called a Nexus."
Digital is an interesting inclusion, just clean up the "essage board" typo. I would include that graphic novels do see console releases in eastern markets where they are more popular, just as an additional piece of trivia.
Civilization generally isn't considered entirely a God game, despite having many similarities. Leaving out that bit would not be missed and make for a cleaner read.
I don't have much to say on Dreamfall except that consoles are just now getting some adventure game attention, thanks in part to Telltale.
I'll agree with the criticism that FTL isn't actually open ended, like you said. Open ended generally implies significant amounts of choice. It is definitely highly replayable though, with no two plays being the same like you said. FTL is a good place to introduce the Roguelike genre, even if it isn't a traditional example and only borrows pieces of the formula. The coding isn't exactly all that fancy, or unique, compared to several of the other examples.
For the choice of Guild Wars, it's not always the best idea to choose an outlier of such a broad genre as the sole representative. Opinions have been decidedly mixed on whether the changes it represents are actually as fun as the mechanics it tries to get away from.
Again not much to say on To The Moon. Some other games may have been arguably more worthy of inclusion, but it is a good representative of a small slice of the Indie scene that has found a thriving home on PC. May have been a good opportunity to introduce the Indie Bundles that drive some of the demand.
Whoever the SMEG programmed this page to use the Arrow key inputs even while putting in comments needs to find a new job.