If you've never been to a Brazilian steakhouse before I'm sure you will love Samba. However, it's not as good as many of the other rodizio places I've experienced.
The salad bar is lackluster. Most places offer crazily stocked salad bars that could get me full for 3 days before ever touching the meat (shrimp cocktail, cured meats, you name it!). I usually have to restrain myself. Here, nothing is all that enticing. The cheese balls that are my favorite thing ever at these types of places are often cold or run out.
The meat is fine but also not as good as at other similar restaurants. My favorite is definitely the prime rib. I wish there were more really good meats (lamb chops, more steaks, etc) and fewer items like buffalo chicken. That's not why I go to a Brazilian steakhouse. They do bring out the most delicious grilled pineapple ever.
Service is hit or miss. I would go back for an occasion because it's all we have in Madison, but I definitely recommend going to a Fogo or a Texas de Brazil for a higher quality experience.