Erm, hybrids want to destroy all of the life in the sector, or maybe even entire galaxy or universe.
Rejoice zerg huggers, now they're getting that viper thing and that Lurker 2.0.
Now see, all those scrapped units still exist in SC universe and are used by armies, just don't exist in melee which doesn't resemble the real situation in SC universe battlefields, but does have various and very intresting units and a balanced gameplay.
Erm, Terrans do have lots of more intresting. Sure, it needs more time to get used, but I say Terrans are as cool as they were. So are the Protoss. Zerg... yeah.
Zerglings can be managed with Hellions and various anti-vermin pesticides.