Criticism of the Space Shuttle program stems from claims that NASA's Shuttle program has failed to achieve its promised cost and utility goals, as well as design, cost, management, and safety issues. More specifically, it has failed in the goal of reducing the cost of space access. Space Shuttle incremental per-pound launch costs ultimately turned out to be considerably higher than those of expendable launchers: by 2011, the incremental cost per flight of the Space Shuttle was estimated at $450 million, or $18,000 per kilogram to low Earth orbit (LEO). By comparison, Russian Proton expendable launchers, still largely based on the design that dates back to 1965, are said to cost as little as $110 million, or around $5,000/kg to LEO. When all design and maintenance costs are taken into account, the final cost of the Space Shuttle program, averaged over all missions and adjusted for inflation, was estimated to come out to $1.5 billion per launch, or $60,000/kg to LEO. This should be contrasted with the originally envisioned costs of $118 per pound of payload in 1972 dollars ($1,400/kg, adjusting for inflation to 2011).
It failed in the goal of achieving reliable access to space, partly due to multi-year interruptions in launches following Shuttle failures. NASA budget pressures caused by the chronically high NASA Space Shuttle program costs have eliminated NASA manned space flight beyond low earth orbit since Apollo, and severely curtailed more productive space science using unmanned probes. NASA's promotion of and reliance on the Shuttle slowed domestic commercial expendable launch vehicle (ELV) programs until after the 1986 Challenger disaster.
Read more about Criticism Of The Space Shuttle Program: Purpose of The System, Costs, Cultural Issues and Problems, Shuttle Operations, Accidents, Retrospect, Future
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