I think the biggest problem is just how quickly units do damage and how fast fights go. It's way too fast! Brood War has slower fights and it better for it.
Indeed. While the damage & health numbers are the same between games, the improved “MicroAI” of the units makes them much more efficient.
Doubling the health of all units, would make the game more interesting.
Interestingly that’s my biggest issue with dota2, and with ssb (I thought the first ssb64 was amazing because it was pure skill, after that it’s just a mess)