I was busy compiling a post in notepad (in case I lost connection in the pub where I am now - thank god for beer when reading threads like this) when I read this submission of Rich's.
In 8 pages, it's probably the best thought out and sensible comment made. I would go further and request that all the expert doom-mongers predicting failure produce a properly researched report that gives a timescale for their predicted non-introduction of rolling stock, the predicted failures, the cause of each failure and the total cost of each failure - and then sign and date it so their comments can be assessed for validity at some point in the future.
In other words, if you want to retain credibility, put it up for historical scrutiny. "I think they're rubbish because I don't like the shape of the train" isn't good enough because believe it or not, most passengers don't care about things like that.
I recall a similar, whining, glass half empty approach by some clown on another forum a year or so ago regarding the introduction of S stock to the H&C and Circle lines. The end result was (surprise, surprise) they're here now with very little delay and are very nice trains, far superior to what went before and actually make the journey a whole deal more pleasant.
The Victoria Line is not having many problems with its Bombardier trains and the same goes for the London Overground. The introduction of 378s was greeted with derision by many due to their manufacturer. Funny isn't it? London Overground is a runaway success........not possible with crap trains.