Nicky, I lived most of my life in NJ, and did my undergrad at Rutgers-Newark, so I am a fan of Rutgers as well, even if I am not supposed to be. I do regard Rutgers (main campus) as a top-notch university, but I don't know about top 30. Almost all of the schools listed have a good argument, including UConn. There are a lot of different rankings, and I've seen schools, like Maryland, rank anywhere from around 20 or barely making the top 100. I see Maryland didn't make the cut in the top 50 either. All of these rankings have different criteria and metrics, so results can and will vary widely. To give another example, most rankings involving Texas A&M (another school I follow) always ranged between 50 and 100, and they are 20 in this ranking. I think this particular ranking focuses on undergraduate, so I don't think the acquisition of the medical schools would have made a difference (even if it did, it will take time to shake off the corruption/incompetence that occurred at UMDNJ for ages).
Also, if you get a chance, check out the Rutgers 2030 Physical Master Plan for the three campuses. The plans for Newark look pretty cool. I hope they will able to follow up and complete it.