Dude, it took me until the end of my first year to even step FOOT in the sci li. Libraries, while a nice perk, are not something to decide your school by. I personally just study in my room or the studio.
Brown is also full of supportive deans and faculty
Has a tremendous variety of cool classes from which to choose (huge plus)
Has an A/B/C/No Credit grading system focused on learning and not grade-
mongering
is in Providence, which is a fun college town
Has the best women's rugby team in the country

Offers you the ability to create your own classes (GISPs) or major
Is full of very friendly and welcoming people
Has a good social life
Has a good balance between social life and academics
Allows you to "shop" classes for a few weeks before committing to them,
and even then you can drop at any point in the semester
Allows you to take classes pass/fail (S/NC) so physics majors can study
faulkner without worrying about screwing their GPA's...and vice-versa
Has a ton of cool clubs and EC like ballroom dancing, intramural improv,
contra dancing, cricket, FMLA, FemSex and MSex, etc
Has a great Queer Alliance, if that's your thing -- and if it's not, it's a tribute
to the open mindedness of the student body
Has a student body that is brilliant, passionate, interesting, and likes to
learn as much cool stuff as possible.
A very small greek scene
AWESOME co-ed frats for those who don't like the typical Greek scene but
love community and fun
Will soon have a student center, more green space, a new fitness center,
and a creative arts center (see building brown campaign)
Offers summer now semester paid research internships (UTRAs) / has
a lot of undergrad research opportunities
Has some very unique fields like Egyptology and History of Mathematics
I could go on...feel free to pm me if you want more gushiness about why i love brown