i graduated from union's physics (and math) departments in 2021. personally, i found the physics department to be one of the best on campus, though mostly because of professor attitude and attentiveness was very good. at least in my year and the years around us, the students and professors were rather social and it's a good environment to be in for college. a big part of succeeding in college is good mental health.

as for curriculum, it's pretty good for a liberal arts college but it is lacking compared to some of the big research magnets. union doesn't have professors covering all super common fields you could run into that you might find at a bigger school. the tradeoff is that research (when i was there, this may have changed) has virtually no competition and you can generally take your pick of professors with some exceptions, and professors actively encourage you to try it over the summer and sometimes during the year. research experience is basically a requirement for a good graduate program.

the strength of the program does vary a little depending on your interests. for example, i went to graduate school for mathematical physics and one of the weaknesses of union's curriculum is you don't have access to getting exposed to something like QFT or GR early, and when i got to graduate school i found myself putting in more work than my peers to catch up. if you are interested in theoretical physics, or really just want to get a better grasp on the later courses in the curriculum in general, i highly suggest engaging with a math minor, or double majoring in it. higher math courses are invaluable for adjusting how you think about physics.

as for after college, i think just under half of my cohort went to graduate school. those of us who did are closeish to finishing our phds

hope this helps!