BFTrick hit the nail on the head, in almost all eldar armies, the wraithlord is used as a distraction, and is often used to lead the faster, deadlier units the opponet has, away from the more vurnerable eldar units. The trick to winning against eldar is to know what to kill, and it isn't the cheap wraithlord, really you should just ingore it and kill the guardians, farseers, vehicles, if you can, and the aspect warriors, especially the aspect warriors, unless the wraithlord starts getting to close to your warriors, but by then you should be able to get enough shots off to send it back to the infinity circuit. I know since I play eldar as my main army, and use my wraithlord as a distration every time I use it, although it does make it's points back in most games, there are better things to keep alive in eldar armies than it, so why not try to get it killed, saving other units from the shots instead.