Actually, the 'increase' in XP for CoH was a direct result of AOE and defense nerfing, which meant most people were taking down mobs slower. The debt reductions (missions and now cap) are great, but the debt (and other massives penalty systems) really rather suck...
I would say WoW is the best because you're just losing some time, which sucks, and can really mess up a quest you're working on.
Of course, you can also argue that since massives are all about getting xp (or skills in class-less systems) over time, every penalty is about time and therefor xp (or even loot). The point is, it doesn't feel so good losing anything you've worked hard for, but if there were NO penalties (and WoW is close in some circumstances), then people wouldn't mind dying at all.
Also, pretty sure duration res sickness in WoW is scaled (dependent on # of recent deaths), and I have never had more than 10 mins of it, even have a huge chain of deaths (from wandering in zones I shouldn't yet be in).