IMO you gotta look at the whole package:

1. Technical Ability.
2. Tune selection.
3. Set building.
4. Attitude and how the DJ reacts with the crowd.

All the above will depend on:

1.Where the DJ is playing.
2. Wot time the DJ is playing.
3. Wot Dj has played the set before.
4. Wot DJ is playing the next set.

Unfortunatley you can pick faults with at least one of the above with DJ's in the world.

IMO the British are the best in the world so it is easy for us to rip other DJ's (espically Europeans) but I find the more I look on the positive on the DJ's sets and less on the negative them more I learn about the DJ and the scene in general.