Agreeing with Klashikari, I felt the main problem with the episode was that everything was just so over-exaggerated...
Especially the part where Kirino came in and they started the entire screaming fight... I was left ( O_O)... but not in a good meaning. I wonder if the scene would have worked if they did it a different way, but this (short) arc ended up being rather poor.
And... They finished an entire volume in two episodes?
From the pattern from the previous arc.
And another thing I didn't really like was that everything was pretty much the exact same pattern as last time, just swapping the dad with a friend, which to be honest, is a lot less convincing than a family member. The sister causes problems, gives Brother a bad attitude, and the brother goes and sacrifices himself for his sister.
To be honest, Ayase was annoying (less than Kirino though), but Brother isn't any less annoying.
And anything Kirino suffered from really felt like Just Desserts for the way she treats her surrounding people. So no sympathy there.
Sandbag Brother really turns into a sandbag this episode (where he got hit). Ouch at the balls... (>_>)
I guess the most enjoyable part of this episode was the very beginning, where Ayase does a slight facial distortion over Kirino running away.
Also, I wonder if Kirino meant it or not, but apparently, Ayase is on the level of eroge.
That's pretty mean.
Also, I just had to think about it, but:
Ayase: What's in the bag?
Word: Naka ni Dare mo Imasen yo...
Anyways, I hope the next arc does better.
Which happens to be the "normal" girl?
PS: By the way, what was that Perish Song running in the background of ED? I felt like dying in 3 turns from that...