There is no one-size-fits-all answer to this question, as what makes a university good for one person may not be as important for another. With that said, generally speaking, NUST is considered a good university. It is consistently ranked among the top universities in Pakistan, and has been accredited by the Higher Education Commission (HEC) of Pakistan. Additionally, NUST is a member of the Association of Commonwealth Universities (ACU), and its engineering programs are accredited by the Pakistan Engineering Council (PEC).
So, if you're looking for a good university in Pakistan, NUST is definitely one to consider. However, ultimately, you'll need to decide what factors are most important to you in choosing a university, and see if NUST meets those criteria.