What makes a great investor pitch deck? What should it contain?

To continue the point made by Wallace Ho, 

From the perspective of investors, they would have thoughts like "What makes this startup interesting". And even though investors may be interested in profitability ratios and IRRs (Internal Rate of Return), you would have to capture their attention and interest first. 

To do that, crafting a story behind your startup would be great. It can include what inspires you to create, what problems that you want to solve for everyday people. Storyboarding can be a place to start.

If investors are drawn by your story, metrics and numbers can be easily pitched to investors.