I dunno where in the conversation this is, but I'll add my own personal experience with spanking:
My parents spanked me up until I was in late elementary school or something (maybe middle elementary school, I don't remember). More so my dad, since my mom was more about the whining and nagging and so forth. To be honest, I preferred spanking. Sitting down and having my parents tell me over and over where I was wrong and where I had to improve myself and all that was just annoying at best and depressing at worst. Spanking, yeah, it hurt for me, but at least it was over in half a minute. Lectures were an hour or more. I find it odd, but for some reason I didn't really mind spanking too much when I was older and it didn't really hurt for some reason. Maybe I'm a masochist.
Anyhow, to be honest, I wasn't afraid of spanking, I was afraid of my parents being disappointed and/or angry with me. That was what really scared me. Spanking? Bah, temporary pain. But parents who don't think well of you? That's a long-term shame. For instance, when I was a kid, I was always scared of going to my friends' house, bcause my friends had the "violent" video games (i.e., not rated E) that my parents wouldn't let me play, and I was afraid my parents would find out and be angry at me. This is the sort of thing that still troubles me to this day. I have a good relationship with my parents, and I can trust them with personal things if push comes to shove, but I really wish I could trust them even more, because I'm really just afraid of their reactions. And they're not even really that "Asian". They're just really overprotective, I think. And I was just way too passive and obedient as a kid, and even now.
I guess you can say it worked for me. My parents didn't spank me unless I was really, really acting up, although I never really acted up. Sure, I was stubborn as hell as a kid, but I also was naturally passive and quiet, so I didn't really jump around like a hysteric when I didn't get my way. My brother, on the other hand, was the loudmouth. He was screaming the moment he was born, so my parents spanked him a hell lot more since he was not as well-behaved as I was (at least externally). Spanking, I have to say, didn't really work on him. He was even more stubborn than I was, and while I do know that he didn't 'like spanking, I guess his train of thought was "@#$% this I don't care, dad". Eventually my parents just gave up, and they're ironically sort of more lenient on my brother than I was. Although I have a much better relationship with my dad than my brother has.
So, basically, my point is, at least from my experience, spanking was neither bad nor good. It really depends on the personality of the kid. It's not just what sort of punishment better suits certain kids. It's hard to know exactly where the kids' trait-based problems are, but the punishment has to address that somehow, i think. It's also having to find a delicate balance between... you know, I don't know what I'm saying. I just wanted to throw out my own anecdotes, if anyone cares. My parents still showed me a lot of affection for me when I was younger, so I think that sort of helped, too. Or, actually, it also made me feel more guilty when they were lecturing me, because it made me feel really like I did something bad. Then again it's good they gave me affection. Some parents are just really distant with their kids, and the kids are disappointed with their parents for that when they grow up(like my own dad, since my grandfather was a 'traditional' parent and all, being all aloof)
Parenting is quite hard, I'll say.