Now lets think, Protoss psy storm, i would normally say wow this is a terrible thing to deal with so it seems op, however this, a colosus, or an archon (which is nearly melee splash) is all this poor guys have for splash so im sorry protoss, terran stole all the splash so you have to build a support unit and micro correctly to get your splash, or deal with a line splash that can be attacked by air and ground. But hey atleast you have so splash.
And last zerg, Banelings, yes these little critters are awesome, however one ling cost 50 minerals plus you invest another 50 gas and minerals per zergling since they come in 2's so 100 minerals and 50 gas to counter marines? Yet they can spam the marines and eventually you will run out of gas and lose. but if you spam lings they of course will melt the the terrans ball of marines, so spam those banelings and use all your gas while the terran player uses only minerals then comes back later to devastate you with the extra gas they have. But lets stay focused. Zerg splash, Ultralisk, WAY late game so your not going to get this unless the game turns into a turtle or theres really heated battles and you have to pull out the artillary but hey good unit, as well as fungal growth which is splash as well but the infestors range for it sucks when trying to micro them in big fights and they almost awalys get themselves killed to siege tanks to try casting fungal growth.