As I said, I don't have a problem with our current units, they are great. Even so, I feel Zerg is somehow a little underpowered. I think a way to fix this is give Zerg another useful unit. I don't particularly have a detailed idea for one.
I would like to see another unit that utilizes the ranged upgrade, able to attack both ground and air. As for where in the tech tree I'm not sure. Adding a T3 unit that could attack both ground and air would be nice, much more reason for me to tech to hive. A T1.5 1 supply unit would be nice for early air defense, without having to overload on queens.
An area attack unit would also be a great addition. As it is now we have two. The Baneling, witch dies when it attacks as well as having pretty low HP. The Ultralisk, Large and clumsy it doesn't mix well with other ground units and is really only useful in wide open areas. If you count the mutalisk's 3 hit attack we have three (Unless I'm missing one). I would say bring back the Lurker (I mean how bad could the area attack be compared to the colossus?) but blizzard seems pretty sure they don't want it back in the game.
Again I don't really have any detailed ideas as far as additional units go, but what are your thoughts? Do you think Zerg could use another unit, or do you think Zerg are fine as is and not underpowered at all? Some ideas on units, if you think we need another, are welcome as well.