Slow cardio is no good for fat loss.

An article came out in the New York Times magazine last fall, (http://tinyurl.com/ylqaher). They reported a study that found that low intensity exercise did not increase fat burn post exercise. I find it kind of funny that we still see research like that. A study published in 1994 by Dr Angelo Tremblay showed that high intensity exercise was the best way to burn body fat. The higher the intensity, the more fat calories you burn after.
Slow cardio can improve your fitness level to a point especially if you are a beginner. But if you are healthy and want to lose some blubber, intensity is the answer.