Answer:
Since the kosher-laws are Torah-laws, there are no bad points. However, Torah observance is not meant to be very easy; and the kosher-laws do have their difficulties and challenges. One who keeps kosher will not be able to eat more than bread and salad at a non-kosher wedding, party, restaurant, etc. He/she will never be able to taste pork, seafood, and various other dishes. There may be ridicule or even anger at the perceived aloofness. Kosher food may cost more.