That is exactly why I put it under suggestion and not criticism dept.
And definitely people can miss it - this is possible as well - I know for a fact that a few times it wasn't announced - not that this is a problem that you need to blow a gasket over (People make mistakes) - but some people really take it to heart - I have seen people angry in guild chat over it - don't want to see that - thus the suggestion - if every effort is made and people still get upset - well nothing you can do about that.
Thank you for expressing your concern, I understand that some people are gettting upset. Please remember that we have many new raid leaders that are still getting acclimated to their surroundings. I believe that not saying that the raid is full in gchat is a disservice to everyone.
As far as people getting angry over not knowing if the raid is full or not, are they are in vent asking about it? Most, if not all of the raid leaders state in their WL Add Spam that if you have questions to ask in vent. When we put out a WL Add we get a spammed with "WL ADD", "WL WHO", "How's the list look?", "Do I even have a chance at getting in?", "Is there anyway I can bring my dps instead of my tank?", "Need me to heal or dps?", etc., etc. PLEASE, if you have questions ask in vent. It's hard to keep up with 2 conversations in a chat situation, much less 5.
Problem: "I don't have a microphone."
Solution: If you are strapped for cash, Whisper someone who does have a microphone to ask for you. In many cases you can use an old set of headphones plugged into the microphone jack.
All in all, I believe that if someone is truly getting angry over a raid invite they need to rethink why they are getting angry. This is a game and you always have the option of doing something else. Not getting into a raid will NOT stop you from living or breathing. I get that this game is fun and awesome and that raiding is a great place to socialize. If you haven't gotten to raid in a while, please let someone know. We try to be as fair to as many people as possible. I for instance, unless I am completely necessary, I will probably step out of the raid for someone else. There are others that are willing to do that as well. With Patch 3.3 coming soon be aware that raid invites are going to be increasingly harder to do since new content means a larger number of people wanting to raid. Larger numbers means more people not being able to get into a raid.
I hope I'm not coming off as stand offish. That is not my intent. I'm merely trying to explain from my experience what happens during the raid invite process. If you have concerns about how things are being done, I'd encourage you to talk to McFierce. He's the Head Raid Leader/Activity Coordinator(Said with a lisp). Feel free to express your concerns to other leadership (officers/Guild leaders) as well.