This Thing You Call Aggro.

[Quark]

I call bull. Just because your class plays better with you switching targets all the time, doesn't mean Warlocks are better at watching a battle. There's plenty of dumb warlocks just as there is any other class.

Rogue: Their combo points are lost when losing targets (bug).

Not a bug. Design choice. Rogues must focus on one target. Stuff like getting feared used to lose combo points, since it deselects the target. Now you only lose combo points when deliberately selecting another target. Ironically this introduced the bug that dead mobs have combo points still on them, so you can Slice and Dice them.

Anyway, a Rogue selects one target until it's dead (or something went wrong). If a situation says I should check on a mob's debuffs and my target's not dead, I'll throw an early finishing move then check. But I know I'm better at watching the field than many. Sap, Sheep, Seduce, etc, all have visual effects. Learn just what makes a visual effect - and other people really could stand to learn just what a blinded mob acts like - and you don't need to select a target to see how it's doing.