I say, use what you like.

With that said, I like Twitter because I am cheap. I dropped my unlimited text messaging since I am required to have unlimited data with my iPhone. So I abuse the Twitter app.

Now, I filter mine very simply: the main page is all the crap people like to tweet; useless or otherwise, but I have people 'direct message' me on Twitter for more important messages.

So far, in my specific case, this works fine.

I do, however, agree that they SHOULD come up with more filters to increase Twitter's functionality.