I'm sorry, but regardless how you stretch the imagination, every girl or woman in the game is prettier than Gretta, with the exception of Old Celestina and the princess in her old woman disguise. It's time to accept that your preferences are niche.
Or maybe you shouldn't be the one defining what is attractive and what isn't. The simple fact is that there will always be someone that people will consider attractive, even if they don't fit into the conventional. That isn't a niche preference, its simply a preference.
Here's a little experiment. Look up these three models: Candice Huffine, Robin Lawley and Jennie Ruck. All three are drop dead gorgeous and are plus sized models. Would any of them fit into what would be my version of "attractive"? No (I'm a leg man, give me long legs for days and I'm happy), but I simply can't deny they are three incredibly beautiful women.
Point is, you can't speak for everyone. Just yourself. If you don't like a character because they don't fit into your particularly narrow scope of beauty, that's fine. But don't try to tell people they're wrong for expressing their own opinion.