First of all I'd say take a deep breath. Do not let what others are telling you ruin your game. Listen to what they have to say, but don't take it as the gospel truth. A lot of times people who, themselves, are doing a poor job are quick to seek blame on others and if it's not the tank or healer getting blamed... it's usually the hunter. If someone is giving you constructive feedback, however, try to be all ears - these people are normally trying to be helpful and may or may not realize the trouble you've had with others simply blaming you and calling you a bad hunter.
All that aside, based on your post, I've noted a couple points...
Sounds like you've done Watcher raid, that one can be a challenge for a PuG group and a lot of people are under the mistaken impression that if they are over level on the content... it's a faceroll. That particular raid (as with the majority of raids in this game) is not. If you're dying in that one, it is not your fault, but the fault of either the leader or fellow group members who are not listening or doing their job.
That specific instance aside, by the sounds of it you are doing things correctly. But unless you're running with max level tanks and/or healers, try to consider that they're a bit out of their element and trying to adjust to their role. You don't always have to necessarily wait a long time to begin dps, but start small. Quick Shots and Barbed Arrow are usually a good starting point. Then work your way through your rotation up to Swift Bow and Pen shot when the tank seems to be comfortable holding the aggro. Don't be afraid to swap to Endurance, pop Quick Shot, and even hit Beneath Notice if you realize you've gotten the attention of the mob. It's not a quick aggro dump, but most tanks should have their forced taunt in reserve for "oh ****" moments like that to reestablish themselves (if you notice they're using something like Challenge to work their aggro from the start, go lighter on your DPS - it means they really don't have any of the necessary threat generated and likely anyone with high DPS/HPS will soon be... "tanking").
Lastly, armour. At your level, I'd keep plugging along at leveling until you hit 75, then take a look at getting the Draigoch pieces (4,152 Marks and 1,432 Medallions for 4; 6,225 Marks and 2,148 Medallions for all 6 pieces). If you really wanted, the old 65 Mirkwood gear is available in the skirmish camps (Classic vendor - 3,654 Marks and 1,260 Medallions for all 6 pieces). But personally I'd wait and save marks/medallions until you reach a level (75) where the armour would last you a bit longer (to 85), but that's just me.
I'm curious what server you're on, if it's Ark or Ridder I could pop in and inspect ya and give some more detailed feedback based on gear and weapons and the like if you were interested
[center][color=#CC3300]Lieutenant Sersi Niflhel[/color] [color=#666699]· [i]Retired[/i][/color]
[color=#993333]"I will give you no quarter, and I will take none."[/color][/center]