Well I linked it last page but gonna link it again since I got a PM about it too, here's the guide I wrote on my EA build:
http://www.pathofexile.com/forum/view-thread/172483
To answer quickly, EA isn't a typical attack, you don't gear at all for attack damage, you don't gear anything really, all you need is a Quill Rain and the correct sockets/gems and that's about it. It's one of the cheapest strong build you can make, it requires an initial investment unlike say LA, but you never have to spend more later on, Quill Rain is your endgame weapons basically(you can find a better weapon but the chances are ridiculously low and it only starts dropping at like 74). The passives you want are the aoe and elemental/fire dmg stuff in the templar witch area, for damage. Don't need a whole lot of it though.
Have to understand however that there's multiple variations of the EA build, the main ones being Blood Magic builds(generally marauders but it can be done with other stuff at the expense of wasting at least 1point like witch or templar) and the EB builds like mine, or the hybrid build where you don't pick Blood Magic on the passive tree but link blood magic and life gain on hit+LMP to explosive arrow so you can use 3x 40% auras on your mana while doing Blood Magic, at the sacrifice of a support gem. Within these variations there's even more variations with the LMP/GMP/Proliferation choices. My build relies on a single explosive arrow shot that will then proliferate large burning dots and elemental equilibrium to increase that stuff, but the LMP and GMP builds don't use all the burning stuff and instead kill on the explosion. Now it seems better but for example my build is better at killing single target(without using another ability) as well as coverage due to proliferation aoe being way larger than explosions especially once you have the aoe passives and the coverage is also uniform and lasts for several seconds, while LMP/GMP can be irregular depending on obstacles or mobs positionning.
I'm in the process of uploading 2 more videos I shot just now to show how the build behaves now that I've finally leveled the AoE stuff and not just health, it's a ton more efficient(probably could have done it before finishing health tbh, it's only 7points so I wouldn't have still had like 3600health or so which is acceptable but eh safety first). It's pretty fun to play, a lot more "complex" than just spamming one key since you have to count the shots, wait for the explosion and now I've also added LA to my set to proc elemental equilibrium before and after explosions(before for explosion dmg and after for burn damage since the explosion gives the mobs added fire resist) so it's a lot of buttons to press especially with the high attack speed.
However and this is important, LA is still vastly better. LA is simply super strong right now, it was super strong before and was nerfed into the ground and it's still probably the strongest ability in the game. Well maybe dual totems I don't know, funny though cause both specs were OP and thoroughly nerfed, and yet here we are, still the best. EK and Freezing Pulse are pretty good contenders too but EK has a major flaw(reflecting physical damage) and Freezing Pulse has some severe downsides too(mostly doing shit damage at more than half a screen away).
Edit: 2nd map, don't really know where to go/what to do since I haven't really paid attention to streams during maps, works out fine though.