Percentages are percentages. The HP numbers may be larger in CO but 50% damage resist is still 50% damage resist. And regeneration vs. lack of regeneration still means my HP stayed rock-steady at the top in CoH against all but the toughest enemies, while my HP in CO drops against Villains and drops quickly against Master Villains. (Heck, since I picked up Bountiful Chi Resurgence, I note my HP drops even while regenerating)
And the saddest part of all is despite all that, as fragile as my CO characters feel compared to their CoH counterparts, my characters in CO still feel far more powerful than my characters in every other MMO I've ever played, to the same degree that my CoH characters felt more powerful than my CO characters. My characters in most games are nothing but damage magnets who quickly die over and over, regardless of class, role, or strategy. (In one game I play, my character is only decent because my wife gets her guildmates to give me free items. Every attempt to find or craft any high-end gear for myself ends in failure. I'm just wearing other people's hand-me-downs, and I'm still always the first to die. I don't feel heroic - or effective, or useful - at all. I'm committing suicide every time I solo, and I'm dragging everyone else down when I team. That's not fun for me or anyone around me)
As the topic title says, I can't do this anymore. I can't pretend that other games - any other game, MMO or otherwise - is even a tenth as good as CoH. CoH held my interest for two full years, even when I couldn't afford to subscribe due to joblessness (and they had so much planned for the future I wasn't going to get bored any time soon). No other game has done that. In particular, I'm utterly bored with CO after less than two months (and their "future" is just more lockboxes and cash grabs, rather than new powersets, zones, and story arcs, so there's nothing to look forward to).
I seriously miss CoH, and I'm seriously depressed about it.