… should:

1. Conceptually and intuitively understand how people learn.
2. Know how to connect with an audience on an emotional level.
3. Be capable of imagining oneself as the learner/audience member.
4. Be obsessed with learning everything.
5. Brainstorm creative treatments and innovative instructional strategies.
6. Visualize instructional graphics, the user interface, interactions and the finished product.
7. Write effective copy, instructional text, audio scripts and video scripts.
8. Meld minds with Subject Matter Experts and team members.
9. Know the capabilities of eLearning development tools and software.
10. Understand related fields—usability and experience design, information design, communications and new technologies.

http://theelearningcoach.com/getting_started/10-qualities-of-the-ideal-instructional-designer/