I can recall a number of times scrolling through the entire home page for a company, only to still be confused about what the product actually does. I see a huge banner image, coordinating colors, tons of whitespace, very high-level text content...but little that says, "Our product will specifically do this, that, and the next for you!". I have to click around to find that out. By that time, I'm quite annoyed, and I'm not sure if your product is worth my effort.
Maybe my expectations of a home page are wrong though.