Wow, that's an overstatement.
PS I went to London Central HS (school for American military dependents) in the 60's. Ate a Wimpy's half of once.
Half of once? You ate a few bites and couldn't take it anymore? I'd believe that; they weren't very good.
The first time my wife and I ate there we noticed all of the Blokes (British) staring at us. We decided it was because we were eating our hamburgers with our hands while the Blokes were using knives and forks, as usual.