Share your in game exploits!

I feel the best single piece of advice I could give to players, especially regarding builds, is to not just a build. Of course you should experiment, polish, and perfect builds; gear, skills, play styles, etc. all working together. But I think if you limit yourself to just one build that you've really gotten down, you are not only limiting yourself, but limiting the fun you're probably going to have playing, and your contribution to your team. So my advice is this:

Play as dynamic as possible.

Now, that doesn't mean don't ever go in without a plan, for sure. What I mean by that is, change your play style as much as you are comfortable/experienced with to take advantage of your situation. Evolve as you go, all depending upon your current situation, including things like: what resources you start near, being probably the most obvious one. Find yourself surrounded by Elder Trees and Gold Deposits? Take advantage of it. If your build doesn't include items crafted with Infused Lumber, or whatever, consider changing that. Have several builds in mind that work best in different situations. If you feel the odds have been stacked against you, play more defensively, stay just a little closer together than you would normally. Or sometimes the opposite happens, you find yourself without any rare resources nearby, maybe ones you need for your build. Keep this in mind: One really quick way to get yourself killed is to waste a huge amount of time looking for a resource that you feel your build is dependent upon. Because while you're maybe running around for a whole day looking for a stag for that Warlock's Vestments, remember, the other tribe is likely spending that whole time progressing, and you have nothing to show for it. And, if you want to get technical, if you're having a hard time finding rare resources near you, that does mean there is a higher chance that that's because those rare nodes are closer to your enemy. Which is not good for you!

This also goes for quests, especially those that increase your skills. Did you or somebody on your team Build Lorenor's Monument and get 5 extra art? Look at what you have, what's around you, etc, and consider making use of that extra tier of gear you can now craft. If you find yourself in possession of some bitchin' quest items, say Frost Needle or Murloc Doomhammer; these are items that you can focus an entire build on. Don't waste them by combining them with items that won't potentiate their lethality.

tldr;
Gather as much valuable shit as fast as you can. Evolve your build depending on what shit you can find as fast as possible.

This probably isn't case anymore, due to the recent change of the quadrant resource mapping.

Support always helps
unless enemy focus the support