(The HPMOR discussion thread after this one is here.)
The previous thread is over the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it. The latest chapter as of 09/09/2011 is Ch. 77.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, and AdeleneDawner has kept an archive of Author's Notes.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it's fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that "Eliezer said X is true" unless you use rot13.
MoR Harry did seem like a Marty Stu in the early chapters, but the further I read, the less I thought so. For one thing, his intelligence is balanced out by egotism, insensitivity, and inability to think in the longterm. For another, most of his really impressive feats of intellect and willpower are actually owed to Voldemort's horcrux (his "dark side"), which means Harry doesn't get full credit for them. I think MoR Harry is far from perfect.
You're totally right about the house system, though. That's why I really love the subplot about Quirrel's armies; it breaks up the house system and lets all the students interact more. I'm so glad we got to know the Slytherin girls...
Wait... you don't attribute dark side Harry to Harry? Damn. They're the main parts I empathize with!