Well, once more, how about the maxim:
A superior pilot is one who uses his superior judgement to avoid those situations that might require his superior skills 
Some tips, in addition to the ones provided by "Few Cloudy":
- Use the different tilt and range available through the right (or left) ND or any additional display to top your own
- Observe the shape of the reflections
- Colors do not mean color, e.g. green is ok at 3'000 but an absolute no fly thru at 30K+
- Look outside of the window
- Switch the radar early enough, which means
before entering clouds
- All clouds are suspect
- Do not take off with defective radar equipment
- As a general rule, cells move with the prevalent wind. But some also do move against the wind!
Any more?