To be effective, satire needs to be clever.  I don't think Ann's letter even reaches the definition of poor satire, let alone clever.  At least ericnorstog (EN) and ScienceDuck (SD) are clever (see above).  Though EN can be quite nasty at times and SD can actually be very clever and very funny.  What I appreciate about SD's humor, sarcasm, and satire is it is almost never mean't to be offensive.  But we all slip occasionally, even for those who try not to.