The way I see it, it's just as easy to tell people how much you hate them and their posts.....just start a thread, like this one. There is no need for the rep system when you can do it in a thread and everyone can see what you posted.
When we had the rep system, I never negged people except when they negged me, I negged them back. And when I first came here, I was told I was stupid to neg back those that had more rep than me, but I figured it was more stupid to just let those bullies continue to neg me when I could neg them back. They kept bragging about how I should do the math....in other words, they were taking so many more points from me than I could take away from them....but really, if they were to do the math themselves, taking 1 or 2 points away from them is better than taking 0 points. So, it wasn't so much about the nice pms that you could send with a rep, it was more about the points, to those bullies, anyway. And I never got a nice note with a neg.....it was always an insult and name-calling. I can still send a pm with this system if I want to, or I can just reply and tell them how much I appreciate their post. Not a biggie, if you ask me.
Oh, and about those that negged me.....well, as soon as I passed them up in points, they quit their negging.... coincidence? Hardly.