The Hunter-seeker is just an inefficient spell. getting it when you are not in a huge lead can put you behind. And its design is bad: it's very similar to a scarab from SC:BW, but thrown from the air (flying scarabs! imba right ), but it doesn't cost minerals to build, it requires a ton of energy and is easily countered and dodged, unless you want to get close and sacrifice a viking to get it in. 1)The raven costs a lot of gas, gas that a Terran needs desperately, you use gas for tanks, vikings, banshees... pretty much every unit excluding marines and hellions, so the only situation i get ravens out is if i need mobile detection, or in some cases for the point defense drone (which is also effective not efficient, but since i already have a raven out, might as well use it, but that's another story) 2)The Hunter-seeker needs to be researched which adds more gas cost, and time to research making it a late game spell 3)The hunter seeker does 100 AoE damage instant, whil