when i mean core units i mean units like the stalker and zealot for the protoss and the tank and marine (depending on the situation at hand for the player)
when i compare the 3 races in terms of mechanics and spells/abilities zerg is by far the most stagnant. protoss has blink, charge for the zlots, force field, guardian shield. where the terran has EMP, fast cliff jumpers, and very well rounded units with clear defining purposes(not that protoss and zerg doesn't either).
in my opinion, hydra and/or muta should have been scrapped and replaced with something new. and dont get me wrong these units are very strong, but this is a new game and i wanted to play with awesome, new zerg units. instead we just get the core units from SC1 BW and it is so boring.
and i do not think the lurker should be brought back. i want blizzard to think of something *new* and defining for zerg gameplay.
That is all xD
(also this is my first post and all constructive posts would be awesome, and please spare my fragile self esteem :P. also feel free to post unit and/or mechanic ideas)