I have a very high signal/noise ratio but that's because I did the work to follow interesting people. But its also true that the noise is encroaching and we as users have to do work to find more signal.
So one of the core problems of twitter is that you are required to do that; it's work. That's fixable.
Certainly the front page for a new visitor should be rich with content.
You can improve the signal/noise ratio by using lists to follow groups of people with common interests. This is even more work, but in some cases, you can follow other people's lists instead.
You can get an even better signal/noise ratio by using Nuzzel, which extracts the most popular stories. Again, you can use it to read other people's lists.
So one of the core problems of twitter is that you are required to do that; it's work. That's fixable.
Certainly the front page for a new visitor should be rich with content.