The binman chronicles
Player Valuation: £80m
Its total cost was £789 million pounds and was open for less than a year. In the brief period that it was operating, it lost more money every two weeks than the O2 Arena (which replaced it) pays in ground rent for an entire year. It had four bailouts, totaling £179 million, in the time that it was open. They could only get rid of it by in effect giving it away, with later profits depending on development and whilst retaining the freehold (the O2 itself was later sold for £35 million between private firms).
This is not what is called success.
Don't think anyone can call it a success, but everything is easier in hindsight. I'm just happy it is still there (seeing was only supposed to be temporary) and it does bring in large events and therefore income now.
I'm sure you can go through countless examples of wrong decisions that have been profligate. Starting with the Olympic Stadium and the Garden Bridge, probably just between those two comes to half of the total for the dome.
While a government should be held accountable for the waste I don't think we should fixate on it.