'Pretentious' means over-inflating your own importance, merit or value, and I don't get that vibe from Extra Credits. They don't go on about how great they are or how important the show is. I would describe the tone as pretty humble and earnest, actually. What they are is preachy. I almost throw up every time they repeat the same old line about games reaching their potential or transcending whatever. I don't disagree, I just wish they would put down the hammer and stop making it so saccharine. Sometimes they don't really do their research very well, or use an example that makes me think they don't really know what they are talking about. Or they neglect to mention details that contradict their point, even if only to argue against them. I guess you could say they don't mention those things because they don't illustrate their point and time is a factor. But it understandably leads to accusations of cherry-picking. My final criticism is they often address topics to which they have very little to say, except: "Who the fuck knows?"
Despite all that I like Extra Credits. I like their message, I like what they're trying to do and I think they do a pretty good job over all. They try to get at the heart of why something does or doesn't make for a good game and offer practical suggestions for making your game good. They're like the anti-MovieBob. Their research isn't exhaustive but they are constructive and earnest, even on the few occasions where they really should have known better.
I have played Loneliness before without knowing what the title was. I didn't pay attention to it, I just clicked the link and started playing. I'm glad I didn't know the title going in because it didn't create expectations or clue me in to the metaphor, which instantly hit me like a ton of bricks. Easily one of the best games, or not-games, I've played this year.
If I must criticize, and you know I must, I would have put the message that appears at the end of the game down below or somewhere else, so the player could end the experience feeling the power of the metaphor.