I would actually say that the flair at an admissions event shouldn’t really count for much.
Some colleges are really decentralized, and every department or office operates more or less independently - so some offices can run very smoothly and others can be a disaster. Even at schools that are more cohesive, though, the Admissions Office is - as someone already pointed out - the one office that your son or daughter will never have to deal with again once they are admitted. So I’m skeptical of the idea that the small details that admissions gets “right” or “wrong” during the process indicates anything about the larger school.
I think this is especially true with Admitted Students’ Day. Let’s be frank - the admissions office is tasked with marketing the college to students and parents, especially at elite schools with high tuition but that don’t necessarily have the name recognition of the Ivies et al. So they’re going to do a lot of little gimmicky things that impress 17-year-olds or jazz it up a little bit, but in the long run don’t matter. Some schools spring for free T-shirts, sunglasses, and large banners. I used to be a student ambassador at my alma mater; there’s always a huge come-to-Jesus meeting before admitted students’ day where they hype us up and make sure that we’re ready to be cheerful and enthusiastic and fresh-faced (and honestly, they select student ambassadors for those qualities anyway). Everyone’s on their best behavior. They plant new flowers and mow all the lawns. I worked in residential life at a different university and I remember the process of selecting which students would be allowed to show their rooms on admitted students’ day - the high-level res life staff would go into each room and take a tour first and assess whether the room was decorated nicely.
It’s a production. It’s a show! And it’s nice and heady, everyone’s excited, it’s a great time. Go for sure, because it’s fun and you meet a lot of your future classmates that way, but I wouldn’t make a decision one way or another solely focused on admitted students’ day. It’s more or less a farce.
I suggest going to visit on a normal day. Just pick a random Tuesday in October or April when there’s nothing in particular going on, and show up. Visit a class, talk to some students, eat in the cafeteria, meet with an advising dean, walk around and sit down on campus with a book, go the library, etc. That’s when you really get the feel of what it’s like to be a student there when they’re not trying to get you to sign on the dotted line.
I also disagree that admissions is a crap shoot. For a very small handful of colleges in the country, admissions is very competitive and even the most qualified students might not be admitted. For the remaining 95-98%, students can pretty accurately predict their chances of being admitted. Some students may need to cast a wider net than others, but there’s not necessarily a need to apply to more than 10 schools. That’s where we are talking about a student who is really teetering on the borderline and/or just really, really wants to go to a college for which she’s not really competitive. If you have a 3.1 and a 1700 on the SATs (and no hooks), it doesn’t really matter how many Ivy et al. type schools you apply to…you simply aren’t competitive for them.
I think that adults - parents and advisers and others who help with the process - should have frank, open communications with applicants, including the honest advice about whether or not they could or would be competitive for certain schools. There’s no sense in letting someone waste money applying to 19 schools that they have little to no chance of getting into. Helping students fall in love with their match schools is important, too.

