I am only posting this since no one is really covering Engineers. I've played with the engineer since launch and was always disappointed with the results when using anyone elses builds. Not that they were wrong, but they weren't for me.
I really believe you have to love your character to play them well - it always isn't about mechanics especially since I am one of the older games - sometimes it is about how much passion you play your character with that keeps you motivated, moving, and having fun. If you have fun while you're playing then it doesn't matter as much when you die, whether PvE or PvP, you'll shrug it off and run back in. Right now this is the only character I have that feel with. If by posting this, I can help one other person who loves the "potential" of the Engy obtain that feeling - then I will have done all that I could - and what I set out to do.
She is meant for open field fighting, but with a few quick changes she can help sieges or defenses. I have been attacked by 3-4 in WvWvW and ran away alive (speed boosts help) and I've been attacked 1 v 1 by a thief and they ended up running away. Do I kill one on one? not usually... just being honest. This build is about surviving and living to fight another day. Support your fellow group mates and have the "potential" to do great damage under the right circumstances. I'm doing this old school since I am terrible at linking...
Armor: All Exoctic
Medium Armegeddon Mask and Shoulders both with Coral Orbs
Medium Amageddon Coat and Leggings with Emerald Orbs
Pillaging Noble Gloves and Boots with Emerald Orb
Dual Travelers Orian Pistols (these were transmuted because of the look 64 pow, 64 per, 90 T - ea.
I have mostly exoctic trinkets, etc. with a mixture of orbs for power, toughness, condition damage, percision.
I end up with 1580 power, 1757 percision, 1541 toughness, 1350 vitality, 869 T, 20% Boon Dur, 2609 Attack, 44% crit chance, 2605 Armor, 19422 health, 20% cond, dur., 167 heal power.
Slotted are Med Kit, Elixer Gun, Flame Thrower, Rocket Boots, and Turret Kit.
Traits:
20 with V, X
20 with IV, VI
10 with VI
20 with IV, IX
0
Highlights: Several traits give regeneration, might, healing skills... Flame thrower will do great AOE, has your KB, and puts incendiary ammo on my toolbelt. Rocket Boots gets me away from trouble and breaks CC while doing damage to opponents but you have to watch your surroundings so you don't propel yourself off a cliff (although in WvWvW this can actually be useful).
This is not a Min/Max build - I see it as straight down the middle. You will survive a lot, do decent damage, help keep groups alive (elixer gun is great with an AE heal plus you have Supply Crate.
It is easy to switch out kits depending on your circumstances. Learn to assess the fight before hand. If I am one on one with a melee type I will kite using bomb kit in place of Flame thrower and sometimes substitue Battering Ram for Rocket Boots if the opponent has no CC abilities. I actually only need to kite vets and above and some lvl 80 mobs - and thieves in WvWvW.
The engineer is a great multifaceted class - learn to change up the toolbelt based on your opponent. When running a group use what is most beneficial to the group which I find is the AE of Flamethrower and Elixer Gun - and the AE on pistols. But again.... this is "me"... your experiences may vary... and yes, it took me many, many, many respecs to find the path that suited me and my playstyle. It let me love my pirate, assassin (she is actually pretty darn good at killing fleeing opponents), scalawag, High Plains Drifter. (I have transmuted much of my gear to give me the appearance of a "gunslinger" - and I play her that way... it gives me the desire and passion I spoke of... I have found myself in her.)
Now if they would give me a "sniper" shot like the Engy in WH ... I would be totally, deeply, and madly in love.
PS. I also have a lvl 80 Necro and Ranger and two more past 50. The Engy was the most fun to play - but that is for me... I hope it can be for you also.