State Universities like JNTU, Osmania, and Andhra University are underrated for various reasons.
Mostly these are the reasons.
Having known about JNTU and Andhra University, I may be able to answer this question. There are several reasons why they are underrated:
Most of the State universities are in a very bad or average condition. They do not invest in good machines with updated features, they keep the old ones which creates problems for students willing to learn industry-relevant topics. This is why many students prefer private institutions, as though they charge a hefty amount of fees, that at least provide new and modern facilities.