I wonder if part of the problem is that this is the first school you’ve visited that was a real choice for you because you’ve been accepted. Could some of the bad feeling been the “Uh oh, now this is real” feeling, not just about the campus?
I agree that the weather is not great there. I grew up about 30 miles from the campus, and the weather is my least favorite part of Ann Arbor. But there are going to be trade offs everywhere.
I don’t happen to agree about the architecture, though — yes, certain parts of campus, but there a lot of beautiful buildings outside the law quad. I’ll also say one of my kids picked a school that has a campus with a reputation as unattractive —but fortunately she was a lot more focused on what was going on inside the buildings when picking a school, and had a great experience at her college.
You seem to be struggling with aspects that I think are fairly superficial to the college experience. Before you make any more visits, make a list of what you are looking for when you visit. My kids were interested in specific academic areas — what is the course sequence in their probable majors? Are there interesting electives offered? Can they tell where those students are going after graduation? Did they get to meet any profs or students to talk to? How big is the dept - profs & students? What is the gender mix in the major for students & profs (my STEM kid cared about this)? How much space would they have for electives vs required courses?
They sat in on a class to get a feeling, and stayed overnight at their final choices. Eat in the cafeteria if you can’t overnight and people watch/eavesdrop.
They checked out ECs, too. One wanted to take some art classes, so we stopped in the fine arts building. Another wanted to study abroad, so we visited that office.
They had questions about the community, too. What was around campus and affordable for students to do? They wanted to know where the public library was. How hard was it to get to/from campus from home? Where are the dorms in relation to their classes? Where do students live after frosh year? Did the dorms have AC?
Read the campus paper online or pick up while on campus. You’ll get a feeling for what the issues are that your tour guide isn’t mentioning.
My point is, if you wander into the visit with no more sense of what you are looking for other than weather and architecture, you won’t get much out of your visit. Also, you need to be aware of your own possible “this is real” reaction sabatoging a school.