halacha theory - Clarification on obligation to see a woman prior to kiddushin

Kiddushin 41a:

"דאמר רב יהודה אמר רב אסור לאדם שיקדש את האשה עד שיראנה
שמא יראה בה דבר מגונה ותתגנה עליו
ורחמנא אמר "ואהבת לרעך כמוך"

Rav Yehuda says that Rav says: It is forbidden for a man to betroth a woman until he sees her, lest he see something repulsive in her after the betrothal, and she will become repugnant to him, which will cause him to hate her. And the Merciful One states in the Torah: “And you shall love your neighbor as yourself”

While studying this Gemmorah I'd like to clarify the following:

1. 
   

   Is it related to the Sugya of מקח טעות בקידושין to invalidate it or it is all about ethics?

   
   


2. 
   

   What does "seeing" refer to? If it's about beauty, Rambam (Issurey Biyah 22, 8) allows examining a woman's face but what about the rest of the body? If it's about Midos (Rambam Ishus 3,19) "עַד שֶׁיִּרְאֶנָּה וְתִהְיֶה כְּשֵׁרָה בְּעֵינָיו" - how do you check the Midos?