Actually, the Soyuz success rate is 98 percent, as was the shuttle's. But that's extremely good considering how much effort has to go into each and every spacecraft, and the amount of things that have to work right to get the thing to launch, dock, and deorbit successfully.
Furthermore, the strategic mistake that could "theoretically wipe out our last remaining foothold in low orbit" is not the fault of the Russians, but of the US. As part of government-mandated cost-cutting measures, NASA cancelled the Orbital Space Plane and the ISS lifeboat, and now we've gone and cancelled the shuttle before its replacement is ready. That's asinine. Between the shuttle and the Soyuz NASA had 99.9996% manned space launch reliability, and with only the Soyuz it's now 98%.
Mind you, as mentioned above, 98% is still pretty good.