So here's what I thought when I got there:
1. What does it do? Not immediately available from the landing page. I'd use something like "Mistrics is a powerful/simple/fast ... that ..."
2. The 3-word motto (pretty uninspired imo; I'd choose a phrase instead) really doesn't need to take up that valuable space.
3. Choose a main font; if you do feel you have to add another, justify your reasoning to do so (for instance if it were a code editor, you could use a monospace font for code samples, etc.)
4. What are you trying to make me do when I first get on your website? Please just let me find one central thing to look at, your value proposition, and then guide my eyes to a call-to-action. Right now, I'm looking at the log in forms, then the motto, then a very sparse description. Try having a simple textual-pictorial representation of a use-case, such as a person having to file through stacks of paper versus a person using mistrics, maybe some screenshots, and then a nice big colorful sign-up button (with just one font and text color!) right next to it.
5. Find a way to fit the login forms from the login page into the nav-bar and make that the main login-point. Of course, if the login fails, redirect to the login view where you can provide more information.
6. Some things are center-aligned, some are left-aligned. I'd choose to stick with left-aligned, since that's how English-readers read.
tl;dr: make sure I know what it is, and guide me in doing what it is you want me to do.