Just to point out - Hiro's tumour was NOT CURED BY HIS MOTHER. The tumour was removed by the surgeons but they said as they were taking him in to surgery that the operation might kill him. Hiro's fight with Adam and his mother healing him were simply him choosing to fight to stay alive. It's a bit of a cliché, sure, but his tumour did not magically go away.
Shockingly, I gave this an Excellent, minus the standard Peter Petrelli Nerf factor and the all new Sylar Nerf Factor and you get an Average.
Well, in real life, "inoperable" means "inoperable," not "fairly difficult to get at, but we can take a crack at it and you might live." If there are no long-term effects on Hiro's health due to the tumor, I'll still consider this one a major copout.