I've been toying with different builds for my ranger as well. For me, 20 in Marksmanship and 20 in Skirmishing are a must. I run double bows, so X in Marksmanship (extra longbow range) and X in Skirmishing (extra bow speed) are requirements for my playstyle. I am primarily a longbow ranger shooting at max range (1,500) and the extra distance really makes a difference (more survivability). In PvE, when monsters are looking for targets within range, keeping at the max range the game allows almost makes me a 'non-target'. Mostly (not always). I use the shortbow for kiting and hitting targets on the move (it has a range of 1,200). Everything else in the trait lines is negotiable.
Yesterday, I decided to try something new. I have been running 20/20/20/0/10 with Carrion armor for extra condition damage off the shortbow. Extra toughness is good for survivability. I was also trying 10 points to make my pets heal better. A pet that stays alive makes good aggro-magnet. But yesterday, I decided to try 30/30/10/0/0. Piercing arrows was really nice to add. And I noticed my dps practically doubled by the change in traits and Cleric armor (more survivability in both toughness and healing power). I'm thinking the way to go is maxing out precision (making critical hits as close to 100% as possible). Giving my pet Carnivorous Appetite would then give it the frequent healing it needed (from critical hits) and an increase in my overall damage output. I don't know if I like the Cleric armor or not yet. Still needs testing. If I need more survivability, I can switch to Knight's armor (very high in toughness and has good vitality and power). If I'm doing okay in surviving, I might switch to Rampager's armor for higher precision and overall damage. Beserker's armor would be my second choice for dps increases. The danger, however, is that focusing just on dps makes the ranger a "glass cannon" and vulnerable to heavy attacks. So my goal (at this time) is high precision with good survivability.
For utilities, rangers are petty sad. Many of the utilities need serious improvements. As they stand now, I use two survival (quickness and bleeding) and one signet (for condition removal). Rangers have poor condition removal ability, so I take what I can get.
I'm hoping the increase in healing power (from Cleric's armor) will also increase healing on my pet. But again, that needs testing. I'm not sure if it does yet or not.
And lastly, since I'm a medium armor ranger, I'm more squishy in combat that say the heavily armored guardians and warriors. So I don't want to melee combat as a ranger. That's my pet's job. So I like to take either bears to tank (highest vitality) or eagle/hawk to run (they grant swiftness boons). Eagles/Hawks swoop in and out of combat. They have the lowest dps, but good evasion. Bears are good for taking a beating. So both work well to keep my target occupied. Their job is not dps, but keeping the target still and away from me. My job is dps. Its a matter of teamwork.
So that's how I roll as a ranger.