This seems to be a major problem lately with startups, especially ones promoted on YC. The home page is often one big image with a little vague text and a "sign up" button. Half the time you can't even tell if it's a shipping product, or much about what it does.
There are people who will click on anything, so this strategy looks, at first, like it's working. ("We have a zillion users and signups! We're ready for another financing round!") As the clickbait advertising industry has discovered, the click on everything crowd does not buy much. Most clicks come from about 10% of users, and they're not the users with money.
A more general-purpose home page has it's challenges, of course, but often it's really just about showing something pretty and guiding users to pages such as 'pricing', 'buy/shop', 'contact', 'about us', etc.
A landing page, on the other hand, is basically the same as creating an ad or a commercial. You have a limited time to 'sell' something, and the fact that you need a page for it means that it's not immediately obvious what you're selling. You have to write ad copy, consider the visuals, target audience, selling points, etc. This is much more difficult than just having a few pages that do very specific things, and a home page that points to them.
http://welcome.linode.com/features/
This gave me 0% of what I wanted and no way to get there, I was confused before I realized it was just a glorified shitty landing page.
Fuck them for trying to scam me into creating an account and making me waste my time, I thought.
A side effect of the current design trend is that navigating to a specific piece of information, or seeing what's changed usually takes another click or a lot more scrolling precisely because the actual products and support contacts are relegated to a lower priority than the full screen "We make software (and have good taste in stock photos)" message.
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.