The problem I have with most JRPG characters (although I'm by no means experienced) is that they are so unrealistic, even from the POV of other computergames, that I cant identify with them nor can I suspend my disbelief.
I dont see how a 5'6" tall, 130 lb 15 yr old with a 50/60 lb longsword is even feasible as a hero, let alone one that will save the world and beat up giant monsters and the like.
Whereas if you take a space marine for example (I'm a big 40k geek) then you have someone that was abducted from their homes at the age of 12, messed around with genetically until they have 2 hearts, 3 lungs, a skeleton made of a combination of ceramics and metal, super dense muscle fibres, a super-hyperactive metabolism and a bony carapace under his skin.
He has no (functional) reproductive system, has been psychologically screwed with until he has an OCD about war and fighting and he has to constantly shield his mind against temptations because if he loses it then he will go mad on a big scale.
Add in the fact he uses a 0.75 cal assault rifle, can spit acid and has been given a hyperadvanced suit of armour that gives him the edge he needs to be able to puch through the side of a battletank.
This is a hero I can get behind. He has a tragic past and a gloomy future, he will die in battle at some point. He has flaws and problems and lives a desperately sparse and unforgiving life. Add into the fact that he can lift a truck over his head, sustain unbelievable amount of damage and survive and suddenly my ridiculously high health bar now makes sense.
If I'm honest then something like that isnt so interesting to play, the best characters are the everyman characters like gordon freeman, max payne and the like. But I'd much rather have some uberpowerful but semibelievable hero than some mincing nancy boy with an overlarge sword, a tonne of hairgel on his head and some father issues.
Especially when I know that if it came down to it I could kick his arse from here to next friday, thats not a hero, thats one of the whiny twats I never talked to in high school.