Okay, Splashee I accept the Challenge:
Twilight Sparkle would be amazed by our level of technology and knowledge and would probably spend her days in our libraries learning about our civilization. However, she would be sorrowed by many things especially the lack of friendship and harmony in our world, how violent our species are in contrast to the ponies of Equestria, our level of ignorance about the world and how it works and last but not least how sometimes we consider some things to be valuable like money fame, etc. but in reality they are meaningless.
Fluttershy would be excited by the level of diversity and complexity our planet has in terms of flora and fauna. Still, she would instantly be horrified and scared when she would learn about how much destruction we inflicted on the environment and the lack of kindness in our world.
Applejack would be excited by the richness of our agricultural products but her happiness would be abated for our lack of family values and the industrialization of agriculture.
Rarity would be excited by the high level of fashion in our world and would instantly participate in a fashion parade with her gorgeous dresses and chilling out in a five star hotel with spa,pool,jacuzzi.I predict that her favorite song would be:
Rainbow Dash would instantly fall in love with rockets and planes and would love tom cruise and spy movies
Pinkie Pie would fall in love with practicaly everything our world has but particulary our addiction to sweets
In conclusion The mane 6 would find our world very similar to Equestria but with a more cons than pros