Though 762's post is a bit harsh, I do understand his point.
30-second arming Wasps are like 30-second arming scatterpacks. There usefulness comes from their shock effect.
As in, "Holy ****, I've got a boatload of potential fusion damage to deal with right now!", when a Lord Commander drops its Wasps on your nose. As it is now, I have a whole turn to dispatch them, so I don't really worry about them at all. The Hydran will clearly opt for rapid-firing Hornets instead. Unfortunately, the Wasps have been made obsolete with the 4.12 patch, in my opinion.