You won your first 3 games?!?
With Dark Eldar? I saw them in a game against Space Marines and completely shocked how they die like guardsmen but cost more like Tau or even marines. I thought the Marine player was dead when a commander and Wyches got out a transport near them, but either they were out of range or the vehicle wasn't open-topped as they didn't assault and ALL died in a single turn of just ONE squad firing on them. I haven't even got 3 victories in about ten games with "beginner armies".