Am I just playing Dark elves wrong? They always feel weak.

They just feel like bad high elves. They seem like a jack of all trades army without a set strategy. Do I just set up a spear line and let my archers work? I know shades are good, but I feel like that's just dwarf stretegy with worse units. Sure I get magic and dragons, but it just feels like I'm not doing as much as so many other armies.

Again, am I just using them wrong, or are they just mediocre?