They don't publish very long write-ups, it's more like a checklist of their particular criteria.
I do think the length of the analysis of GiveDirectly is fairly long (http://www.givewell.org/international/top-charities/give-directly). If you think that the recommendation of GiveDirectly is a mistake based on naive assumptions it makes sense to read the article.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.