That sounds troubling to me. StarCraft made good impressions because it achieved an excellent balance between the three races, and also kept the lower units like Marines and Hydralisks perpetually useful. They didn't simply fall by the wayside once you got up to Battlecruisers. Personally I like to think that, of the three races, the Zerg had the greatest potential to be unbalanced or not work right because of their unique abilities, but they did work. Blizzard got it right back then.
I hate to say it, but the more I hear, the less interested I am in HotS. :/ I will admit, I wasn't a huge fan of WoL requiring online access all the time for Battle.net. But perhaps I'm simply old fashioned.