Here is my take:
1. WvWvW: Rangers are good, but have a very high skill cap. Meaning that it takes a lot of practice and tweaking of builds to achieve success. That said, rangers can do very, very well in WvW. WvW success is largely about situational awareness, knowing your strengths and weaknesses, as well as those of your opponents. One big disadvantage is that optimal roaming builds and optimal zerg-support builds require you to respec (the latter usually needs piercing arrow).
2. sPvP: I’ve only dabbled, but trap/condition bunker builds work well as can power/crit/evasion tanking. Others will have better knowledge about this.
3. PVE: Rangers are amazing. You can safely go anywhere, deal with multiple veterans at at time. When leveling, I would purposely try to get in over my head and see if I could pull through. PVE open world is very fun as a ranger.
4. Dungeons/events/raids: Never done a dungeon.
5. AOE: We are quite poor in this regards. Piercing arrow trait in Marksman line is a very good (but not great) trait. Other than that, our options are limited and pale in comparison to other classes.
