While I think it is helpful to help the OP ID negatives that they may not have thought of about going outside the US, I am cautious, @citymama9 about negatives for any given uni- for the same reasons as in the US: different people see things differently, and even when they see it the same way the relative weight may be different. “Bad food”, for example, is very subjective- and (esp in the UK) there are a lot of different housing options, with different food implications.
St Andrews is very US-friendly, but as with every single uni in the world, it has its + and -. Stark dorms is a question of taste- and for most students at StAs it only matters for first year, as almost everybody lives out after that. For all UK unis, I suggest reading the course descriptions thoroughly, choosing the ones that seem like the best fit (b/c even at StAs the range of options is narrower than in the US), and then visit the most relevant options. Remember also, that many of these elements are not what ends up deciding a college/uni.