If you're really worried about clinical experience, ask the 3rd and 4th year students what they do on the wards when you interview (central lines, chest tubes, intubations, deliveries, LPs, CPR, etc)... That should give you a feel for how much autonomy they are granted, and how much they actually participate in patient care.
Also, ask how many Sub-internships are required and what they do on them (admit orders, dictate, discharge summaries, all procedure, take 1st call). I know there is a wide variety of this kind of exposure.
At Wake Forest we do everything during our Sub-Internships and are equals to the real interns. Our orders go through without being co-signed (but technically require a signature within 24 hrs... but who's counting), and we do admits alone. We change ventillator settings, run drips, give pressors, and narcotics all independently as 4th year students. I give verbal orders to nurses over the telephone. Your upper level helps you with anything you have a problem or question about. The majority of your clinical teaching will come from the residents.... see if they are friendly/helpful or too overworked to give students the time of day (same goes for attendings).
I feel that my clinical experience has been awesome. When I interviewed at Harvard, they were shocked that I changed vent settings and ran drips as a 4th year. I have tons of experience, and would feel comfortable managing Intermediate-care Unit patients with minimal supervision.
That being said, in the end it's not that big of a deal b/c everyone will learn all the "hands-on" stuff in internship anyway. It just gives you a little extra confidence going into internship. And most places have 2 months of sub-internships anyway. Wake is not unique, but I think places that offer 3rd and 4th yr autonomy makes the years a lot more exciting (you get a piece of the action!).