This experience is driven by browser cookies. If you're using a browser where PayPal has been signed in to at some point, then it's going to assume you would be using that again, and it won't show the guest checkout option as prominently. If you clear your browser cache you would probably notice that it then shows you the option to use credit/debit card.
If you integrate the new Smart Payment Buttons via the web service APIs (
https://developer.paypal.com/docs/checkout/) then you can control this, and the experience in general is a lot better.
Angell EYE -
www.angelleye.comPayPal Partner and Certified Developer - Kudos are Greatly Appreciated!