Why? I know almost nothing about it. So I'm asking a serious question because it would help me help other people.
RWJ has a very balanced residency program, putting enough emphasis on clinical training, teaching, and research. Here are some of the main points:
Clinical training is great. You have a good mix of patient populations, from the wealthy to the indigent. Ancillary staff is tremendous. If you don't want to, you will never have to do an EKG or draw blood cultures on the floors. Social work/case management is also great, minimizing those "scut work" tasks. General medicine teams see a wide variety of patients (as opposed to say, jefferson, who has you rotate on GI service, the cardiology... etc). At RWJ, there is more of an emphasis on handling the whole patient and making sure each of their organs systems are covered. The motto is that any good internist should be able to handle all of these problems at once, even if severe, and that consulting should really be a last resort.
Also, not unique to RWJ, but important, there are no private patients on floor services.
Faculty are very supportive. They are there to help you learn. Attendings are very involved in teaching and go out of their way to get everyone involved from the 3rd year medical student to the senior resident. Their approach to conferences is great because they are really focused on the intern and resident (as they are mandatory for both). Its not so much about hearing the input of a specialist (although they do attend), but rather its devised in a way to facilitate the thinking and decision making process for house staff. Board review series every morning for residents not on service is also helpful. The PD is there to make sure you do not fail.
The program is also pretty small (I believe around 20 or so interns). Everyone knows each other very well, and interns/residents are given a lot of individualized attention. Teams are 1 intern, 1 resident, 1 attending. When the time comes to make a call for you, the PD and attendings certainly know you well.
Research is obviously more than available, as is true at many other programs. But residents at rwj have the time to really take advantage of it (call on the floors is q5- not bad! and interns get 1.5-2 months of elective!)
Fellowship match is good. Residents go places that they want to, and are certainly not limited to the NJ area. The program is also very supportive of "alternative plans" i.e. last year they made all sorts of calls for a resident who wanted to go into media. Fellowship match within RWJ is good, except for maybe GI. They have taken a few, but I would say its probably the hardest to match within the program. Heme/onc, endocrine, and cards, on the other hand, are very good at taking rwj residents.
But this is just my take on the place. I would rank it > jeff & temple.