I interviewed as well and having it so early on it rose to my top choices. However after interviewing at other replaces I got the same impression as you.
Still a great program but 2 things stood out:
1) They don't really have traditional labs and instead utilize large datasets
2) Not much opportunity to publish with faculty. I asked a couple of 3rd-4th years who planned to go into academics and they were just prepping for their first pub
So I also interviewed there and was def irked by the program as well. I also asked about co-authorship opportunities, and the professors responded that they do exist but you have to make an effort to be able to do so. I am a student of color, and I did not feel there was a sense of community among the students either....it for sure seemed cliquey, and there didn't seem to be support groups for students of color. I am also debating about this admission offer because like you mentioned, the facilities seem to be top notch and super new but would it even be worth it if I didn't feel comfortable there? Also, I am not sure if you have received your funding packages, but I don't think they compare to other schools I have heard back from...just a thought?