The reasons for this rating are tied to both "Bugs" and "Customer Support".
Lastform seems to have fundamental issues with the current version of Gravity Forms (the backend form builder).
A critical issue for us is that the 'File Upload' field no longer works, which means clients cannot attach photos or documents of the equipment they want to sell.
Wanting to make sure there wasn't an issue with our 2 existing forms, we created a simple test form with the only fields being 'Name' and 'File Upload'. Again, we were not able to attach any of the allowed file formats with the File upload field.
Additionally, support for Lastform is currently pretty much non-existent. We have been waiting for 2 months now but our repeated requests for support (on this site or via email) have been largely ignored. Meydjer seems to be overwhelmed which is understandable, but 2 months of silence is a long time to wait for a commercial site.
It would've been great to hear something/anything from Meydjer to let us know he's either working on it or he's not, but no communication from him was very disappointing.
We have removed the Lastform forms from our site and are now simply using the Gravity Forms versions where the File Upload field works as expected. They don't look nowhere near as nice as the Lastform forms, but at least they work.