Double Rainboom:
Eh. Not a fan. I mean, it was a pretty good cartoon as far as animation and basic plot, but it just seemed to me another pointless, Dash-centered, and meaningless story.
Snow Drop:
Good god, why? WAY too freaking sappy. I enjoyed the Friendship is Witchcraft parody a lot more than the actual work. Again, though, good animation, and the plot made sense, even if it was self-evident and cliche.
Dusk's Dawn:
I actually hadn't seen this animation. Just watched it, not impressed. All the ponies were obviously designed with the Pony Generator (I recognize all the manes), the plot was very, very messy, and the dialogue was just sad. Oh, also, that blue pegasus was totally Pinkie Pie and Rainbow Dash fused together.
I do have to say, though... the theme song visuals were pretty cool, even if the song was such a sad knock-off of the FiS theme song it made me wanna cry. The one song the villain sang was also crappy, but the singer's voice was on point.