1) The Voice of Reason, by Pascoite
What it is: Derpy has a voice in her head: a voice which mocks and berates her at every turn. It's hard to be happy when the voice is talking, but luckily, she has friends and family who help. Sometimes, without even knowing.
A few thoughts: This is based on a couple of the author's minifics, one of which I've read. It's an idea that, I think, benefits greatly from a little extra breathing room, which is exactly what it gets here. The Voice of Reason flits through several semi-connected scenes, documenting Derpy's struggles with the voice via anecdote. There's not a strong resolution here, but I felt that fit the window-into-life tone which the story strikes. Overall, this is a very sweet story, one which verges on excessively sappy at times, but which never goes too far over the edge and becomes laughable.
Recommendation: Folks who like a heaping dose heartwarming in their fanfics will be well-rewarded here--for a story about a debilitating lack of confidence (one which doesn't magically disappear by the end, moreover), there's a lot of sweetness here.
2) An Apple Comes Out of the Cellar, by Seether00
What it is: Applejack has a horrible truth which she must confess to her family: she's gay. Things quickly get awkward, though not in the way AJ was expecting.
A few thoughts: This is a comedy, and it's certainly full of comic stuff, but I can't say I really enjoyed it. Much like a Larry the Cable Guy stand-up performance, this story aimed for a lot of low-hanging fruit, and mostly delivered, with the result being a lot of very flat, one-note jokes. Stuff like Granny Smith waxing poetic about her younger years and Apple Bloom knowing more about sex (if only academically) than her sister are introduced (kind of funny at first!), and then just sort of repeat without variation or expansion. The fact is that it just wasn't for me; there are a lot of obvious, lowest-common-denominator jokes here, and I got bored of it before long.
Recommendation: Look, I'm not going to pretend that this is a bad story, any more than I'm going to pretend that Larry the Cable Guy has no talent; he just happens to be talented at something I have no taste for. If you like Larry or his brand of humor (Ace Ventura comes to mind as another example), then by all means check this out.
3) Children of a Lesser Dragon God Boy Whelp Thingy Guy, by The Descendant
What it is: Following the "discovery" of Spike's publication of the Noble Dragon Code, a large group of dragons decide to worship him as the prophesied one who will restore their race to its ancient glory. Unfortunately, dragons and theology mix about as well as epic battles to the death and plungers (a major plot point, as it turns out).
A few thoughts: I saw one or two people compare this to Monty Python's Life of Brian, so naturally I had to check it out. And whether because that statement put me in a movie-comparison mindset, or by simple happenstance, I stumbled upon an epiphany as I read: The Descendant's comedies are to this fandom as Mel Brooks is to movies.
Brooks is an unquestionably funny guy. Moreover, he has the ability to make you care about characters just long enough for the whiplash when they go back to being comic vehicles to be effective. Likewise, TD manages to work some genuinely empathy-inducing history and emotion in to his story... from which he will typically transition immediately back to the goofball humor which characterizes the larger part of the story. Even as he sells you a tragic tale, he's already taking the wind out of his own sails. That's a difficult feat to pull off effectively, but here I found that the swings emphasized the ridiculousness of the comedy nicely.
But then, there's bad Mel. He's the one who looks at a lightsaber and says, "I bet I could make, like, two hundred dick jokes about that." Tragically, he's right, and parody and comic skewers are replaced with the stuff of which teen boys' giggles are made. Even at his worst, he's not terrible--if nothing else, one must grant a certain grudging admiration to a man so dedicated to a non-sequitur gag that it produces the (in)famous "combing the desert" scene from Spaceballs--but the dropoff from targeted cultural and social barbs to unconnected sight gags is a big one. Likewise, when TD latches on to some joke, he doesn't let go. He makes self-depreciating noises about fanfiction multiple times within this single fic, spends almost half a page on one "wouldn't it be silly if Twilight became an alicorn" joke, and that plunger is practically a major character in its own right (I admit, I thought the explanation for its import was pretty funny, but by about the fiftieth time it was pulled out, I was feeling like the joke had run its course).
Recommendation: I just compared TD comedies to Mel Brooks's films at length, didn't I? I'd put this particular one at about 75% Spaceballs to 25% The Producers, in terms of comic nature; judge your interest accordingly.