More than just 20 years.............
The thing is its actually not that bad when you compare peek to peek. The paris metro is often far more delayed, and less frequent. Not too mention the dog poo (i mean really, on the streets it can wash away, but on trains!!?)
My complaint is how the engineering work is been done, my station was closed for 2 weekends to install benches ffs.
The classic example of the fiasco that was metronet (thanks mayor ken for flipflopping that one) is the waterloo and city line (aka the drain). This was not only opened late, but the refitting was so shoddy it failed to work most of the time because of siginalling issues. This is a line with only 2 stations!
Whats amazing is it still lacks rolling signals, and other such things. I fail to see how it can possibly cost so much to design some rolling signals for a line like the drain at more than £5M.