Serious Answer-
Clearly, not the ideal Presidential ticket, which has created a HUGE divide in our country. If we can set aside the "personal" dislikes of each candidate and solely look at job performance the answer is a bit clearer.
The Democrats (Kamala/Joe) have been running the country the past 3+ years. Can we all honestly say that the country is in a better place than the previous 4 years with Trump? Key determining factors include overall economic health (not just the past 6 months, but the past 3 years combined which include the cost of goods and energy, foreign policy (Israel, Middle East, and China) and national security (border integrity and crime).
To answer the OP, "what has Kamala done to make her terrible", she's done NOTHING! That is the answer, you can't be labeled as "terrible" if you've simply NOT done your job to begin with. She's been a ghost VP that has not made any credible decision to improve and or make our country better. She literally campaigns on the premise of empty promises of free money for all, which include undocumented foreigners who are not legal tax paying citizens, free college tuition, down payments for houses, childcare, etc... Which are all great to have, but who is going to pay for it? In addition, she has no plan on how to achieve this and the impact it will have on our economy. A lot of talk with little substance and no experience or background to execute. At least with Trump, he's been there and done that, and is not a career politician who has ZERO leadership experience and is obviously a puppet for the Democratic party and will bend for extreme left policies.
Put up a better alternative than Harris, someone who can lead, has a plan and isn't afraid to make hard decisions and return America to being a world leader, and you have my vote.