I run a full support wvw guardian build with full clerics armor and jewlry. Mace/shield (sometimes sword/shield depending on the situation) and staff. I run 0/0/20/30/20. Some things I have found:
-To echo the poster above, healing power does not scale well. If you're looking to be useful to your group in any other way, I would say spec into something else. That being said, if all you intend to do is support (meaning, you don't care about winning 1v1s, you don't care about dishing out damage, and you don't care about your vitality) full healing support build can be very useful to a coordinated guild group in the right situations.
-Use your staff 4 skill everytime it's up. With full clerics and 25 stacks on sigil of life, I heal everyone around me for 3-4,000 hp each time. Trait into reduced cooldown for 2 handed weapons and this alone can turn the tide of the fight considering the stacks of might as well. This skill is not limited to the usual 5 targets. So if I have a zerg of 20 people in close enough proximity to me, that's 20 people I'm healing for 3-4,000hp.
-Use staff 2 and detonate it for around 1-1,500 aoe heal. Cooldown is long, so use it early in a fight and often.
-Mace #2 skill by itself is hardly noticable in wvw. But traited for larger symbols/all symbols heal allies, you actually get some nice benefits from it. It means you're getting a healing tick plus the regeneration. Symbol of swiftness also will heal a little bit with this setup, but the healing is negligble. I throw it up as often as possible anyways.
-Tome of courage is your best friend. Use it at the right time and you will be the difference maker in a fight. Don't just stop after you use the massive full health heal though as that is limited to 5 targets. You want to start spamming #1 after that over any groups that need it. These heal for around 1-2,000 each time and are very spammable.
-Positioning is everything. It's your job to stay close to your teammates, not the other way around. As soon as you see someone downed, you should be the first one running to res them. I also run 6 Runes of Mercy for the ressing benefits. The added toughness allows me to tank quite a bit while trying to get downed allies up. This in combination with a well placed sanctuary is basically a free res.
-And lastly, never EVER try to solo with this build. You will not win. Against anything.
I think it's safe to say that if you want to be doing damage at range, you should roll a different class. But the Guard is far from useless in wvw.
I won't reiterate what others have already said about Wall of Reflection and Sanctuary, because those along with Line of Warding can turn the tide of a battle in your favor if used at the proper times. Yes, like others have said, you won't get as many drops. But what you will get is your teammates in vent saying, "That Wall of Reflection was awesome" or "Way to split their entire team in half with Line of Warding" or "Your sanctuary saved my ass". I don't hear anyone saying "Man, awesome timing on your Hundred Blades!"
Going full support in wvw, I never have a shortage of things to do and am having a blast. Even if you're not getting as many drops, I think you would be hard pressed to find a class that is more valuable to a coordinated group.
Entitled to give us more information? Yeah, you're right...they aren't required in any way to do so. It's just good business practice, though, to keep good relations with your customers, especially paying customers. The more forthcoming they are about sharing important information and updates, the better the relationship will be.
Yesterday's BWE update was a good start. Although one can probably question why that wasn't done 4 days earlier?
It's also good business practice to not hand out information that may or may not be correct. People are asking for information that they don't have yet. Look, why would anet keep their release date secret at this point if they were 100% sure of what it was going to be? They don't know yet, so they've wisely kept their mouths shut and not made the same mistake that countless of other MMOs have by fabricating some bogus target date. They're giving themselves time to finish the game properly.
This is the conversation that's been going on:
Anet: Hey guys! You can now buy our game in advance! Be aware that we don't have a release date yet!
Customers: Cool! I'll buy it!
(Several weeks later)
Customers: OMG I can't believe you haven't given us a release date yet.
Anet: We told you we didn't have one before you bought the product.
Customers: Yeah but now that we bought it you should give us a release date.
Anet: ...We told you we don't have one yet.
Customers: Well you should at least give us better communication.
Anet: Okay, what would you like us to communicate?
Customers: The release date.
Customers: I'm off to post on the forums about how bad you are at communicating to me the information that you don't have!