Getting harsh feedback isn't so bad, really. You get that kind of feedback either because people think your MVP is something it's not or because of quality issues, and you can fix both.
A bad landing page filters out people who are just moderately interested. They'll just close the tab and move on. That's going to skew the feedback you'll get.
If you don't get (much) feedback at all you're in a much worse spot. Then you don't know if your MVP sucks, or it doesn't but your landing page sucks, or maybe both are fine but you're just not getting the right traffic. It's way harder to figure out what to do when nobody seems to care at all about what you've built.
A bad landing page filters out people who are just moderately interested. They'll just close the tab and move on. That's going to skew the feedback you'll get.
If you don't get (much) feedback at all you're in a much worse spot. Then you don't know if your MVP sucks, or it doesn't but your landing page sucks, or maybe both are fine but you're just not getting the right traffic. It's way harder to figure out what to do when nobody seems to care at all about what you've built.