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Ever since my experience of my first dungeon and sPvP, I've noticed that the biggest advice is to learn combo fields. Apparently they are a pretty big deal. That being said, in my experience up to level 46, there hasn't been in intro or some sort of tutorial to combo fields. This is a problem.
I think Arenanet needs to put in some sort of tutorial system for combo fields. I know there are plenty of resources online, and I'm not saying I'm having a problem personally with combo fields anymore. But going into the first dungeon at level 35 with no real instructions can make those first few experiences a discouraging mess. Many people are complaining about the dungeon system because of a lack of a tutorial.
I don't think anything's wrong with the mechanics. I just think it's odd how there is no in-game introduction to such an important mechanic. Hopefully Anet will implement one in the near future.