You might be able to run WoW at the high settings with that system. But you should probably plan on using medium settings to keep the game play smooth and fluid.
During online gaming in large raid situation you might need to step down to low-medium settings to get the game play smooth and fluid. The weakest link overall in gaming will be the entry level CPU.
Overall it should also do well in many other more recent games.
CPU: AMD Athlon II P320
- Passmark CPU benchmark score
GPU: ATI Mobility Radeon HD 5650 review