I think Transantiago system was since the beggining a good project, but the brilliant minds that created it never thought about how it works in our city. They didn't think about the problems in the streets, in what really need the people for a nice and fast service.
It's true that in the pre- transantiago system not all the things were work in the best conditions, we know all the advantages, like faster travels and disadvantages of it, like the buses in bad conditions or the steals. In these terms, the pre-system didn't work as the best way and had different problems, so the authorities decided change the system for other completely different.
The bad way of this it's how they installed something without a basic requirements. It's impossible that a system like this works with little streets (for the size the machines) or changing the money for a target or i don't know...
The thing is neither of them it's the ideal system of transportation because we know that they don't working in Santiago and get one better means a lot of money that we don't have. Ideally, the system should keep so many buses in all the areas and good conditions for their workers like cabins for take a rest, special places for lunch and go to the bathroom. Also, it's important think about in a gps, that it's very expensive but it's useful for keep a control for the company and for their users about where are the buses and program a perfect travel without waste the time.
Finally, I want to agree something about my own experience related to transantiago system. Only sometimes I get a bus or the subway, but in general I think that it's unpleasant and slow, it's very discusting take a bus on the summer with so many people in there, but i just prefer to get used to doing and hope that in the time the system can be better.