I agree that for an LOI you should probably focus more on why you and that particular school are such a great match, rather than on why you're pursuing an MD/PhD in general.
dmargul, if you still need one, I can PM you a "letter of interest" that I wrote earlier in the year to a school that wound up accepting me..
I agree that for an LOI you should probably focus more on why you and that particular school are such a great match
Agreed. Focus on:
Is that school strong in your interest? Provide examples. Provide names of PIs you're strongly interested in working for (hopefully you interviewed with them).
Is that school in a particularly good location for you? Close to family? In a big city you wanna live in?
Does it provide excellent opportunities for other types of activities you'd like to get involved in?
Show how these things fit into what you've done as an undergrad.
Sorry I misunderstood. I didn't realize you already had an interview. Listen to Wise Neuronix.
Not meeting them on your visit is a bad sign. It could be something innocent like they were unavailable. It could also be that several of them are not eligible to be your graduate mentors because they have no funding, don't like MD/PhD students, or have abused grad students in the past.
Just make sure you meet with some people you're interested in at second look!