I'm using v1.5 but have the same problem. The clunky checkout applies whether you're using PayPal Express or PayPal standard.
I don't understand why, where PayPal is the only check out option, that it's not possible to go straight from the cart to Paypal.
With Paypal we don't need to collect addresses on the nopCommerce shopping site!
AND, if there's only one shipping option, we don't need to have a step that requires shoppers to make a shipping choice!
All these unwanted/unnecessary checkout steps lose sales.
With your scenario you can apply some custom coding to achieve what you would want. what you could do is set the store as anonymous shopping enabled and by pass the shipping + billing address as this will be input if using Paypal express
.. and if this is the only payment method you could go straight from the cart to paypal, but you would need to code this yourself.JaxUK
Regarding your issue the best option is to use PayPal standard if you are creating user accounts with nopcommerce, As PayPal Express is aimed at anonymous shopping carts.
hope this helps..