How is NIT Goa as compared to other NIT's?

It depends on which NIT you are comparing it to. NIT Goa is a tier-3 NIT and is still on its way to exhibit its credibility, except for the name received from the government. This is possibly the only resemblance it has with other top-tier NITs. 

NIT Goa can reasonably be ranked alongside other bottom quartile NITs, including the ones situated in North-Eastern India (except NIT Silchar) and other NITs located at Puducherry and other similar places. All these NITs are struggling to prove their values as of now.