I think only two of my characters have any points in health: The male Earthling that I first beat the game with (and he only has 15 or so points put into it) and the Namekian I'm working on who will eventually max out Health. None of the rest have bothered and they can all defeat Mira.
For most of my characters, I focus on maxing a single stat before bothering with the rest. My female saiyan has maxed Blast specials, my female Earthling will max Stamina, my Frieza Clansman will max Ki, and my male saiyan will max Strike specials. The only exceptions are the male Earthling previously mentioned and my female majin, who is splitting her points evenly between Strike and Blast and will soon max them both.
These are probably not ideal builds, but oh well