I saw that my toplaner had like 12k hp in a game while my adc had 700 health(yes this was around full hp), this seems a bit extreme don't you think :D
Right now the game simulator doesn't take into account armor or magic resistance so the HPs essentially reflect effective HP.
http://leagueoflegends.wikia.com/wiki/Health#Effective_Health
but still, then the adc health seems a bit underwhelming atleast in my opinion