I agree in principle mostly with everything except the first two. Also, the part about spamming is already covered in the rules, so shouldn't need repeating here. And trolls perhaps ought to be covered by the rules, but are not specifically mentioned at this point.
I agree that we don't want any personal attacks or name calling (also covered by the rules), but I think it's going too far to prohibit sarcasm. Insults I'm not sure about. If it's a personal attack, then we don't want it. Could an insult not be a personal attack? And if so, should we prohibit it?
Another issue: These are guidelines. Are they to be enforced? By moderators? If so, should they be called "rules" instead? Or are they to be more a netiquette that the members themselves try to enforce by gently pointing offenders in their general direction when necessary?
Also, definitions are important. Words like "personal attack", "troll", "spam" must be defined carefully. Aery is working on a little something to explain what we mean by personal attack, but we may need something for other commonly misunderstood terms as well.
I think it's important that rules and guidelines are short, so anything unnecessary should be trimmed off.