Yup, the product is fine, but there's a reason all the other brands in the freezer aisle aren't raising hundreds of millions of dollars at 100x multiples. Burgers don't scale like smartphone apps.
Here's a comparison - Tyson Foods, best known for their frozen meat, had a revenue of $54.44 billion last year. Their current market cap is $21.77 billion.
Beyond Meat reported an annual revenue of $87.9 million in their 2018 S-1, and post-IPO reached a peak market cap of $14.1 billion.
See the issue with these numbers?