What Twitter does, and many other media, is the nature of human beings. It shows how self obsessed we are, how obsessed we are, how stubborn we are, how stupid we are, etc, etc. And that does not only go for the people with a Twitter account, but also for the people who don't have a Twitter account and feel the need to comment on it.
My point is, it's hardly ever the technology that is the problem, but the people. And I don't see that changing any time soon. Just like with books, LP's/CD's/etc, we just have to get used to it (and we will), or it falls out of favor (or this will).
Come with constructive criticism, not that people are stupid, we established that ages ago.
I don't like Twitter much either. It used to be because I kept losing track of conversations that seemed to be scattered all over Twitter. Now I don't like it much, because I still find the setup too fleeting. I like a good discussion with well constructed arguments. It's very hard to have that on Twitter. But Twitter is developing. You can make a point longer than 140 characters and you can add more and more sorts of attachments. I only use Twitter to remain updated. Most of the tweets I don't read.
Now, if all the people would go away, Twitter would be perfect. j/k, just being sarcastic.