Eldar are packin', they seem to be packin'. The book seems to be exploding with AP 3 or better weapons, both ranges and melee. And the Wave Serpent is stupid hard to shoot down with its cover save and treating 5 out of 6 penetrating hits and glancing hits. What's a power armor army suppose to do other than ask GW for a refund on their models?
Eldar have always had an abundance of AP3,2,1 weapons.. and they will always outmaneuver every other army.
Massfire is definately good, force their troops out of their transports whenever possible. I wouldn't play too defensive, as you will quickly find yourself surrounded.
Just remember that Eldar are designed to be glass cannons, they can dish out a lot but they can't take it back. The only exeption is any type of wraith construct, but they cost a lot of points for the Eldar player.
Hope that helps