For the most part, the CCP and their decisions have been largely credited for China's stellar growth.
If you've ever been to China you'll quickly see why. If the government wants something done, its done. Case in point: 2008 Olympics, special economic zones, foreign exchange rate policies, etc.
Before kaifang (opening), China was ass-backwards. The CCP's sole claim to legitimacy is a bizzare positive-negative re-enforcement of two points:
1. Negative: China has been bullied by the world until the CCP came in 2. Positive: China is now an economic power because of CCP policies
The CPP uses these two points to bolster each other in linking CCP directly with nationalism so that pro-China = pro-ccp.