You are missing one piece of information to do the analysis: how much it would cost to do the refi. There will be fees.

However, you would be lowering the interest rate on all but 1 of the loans, and paying them off faster. Without doing the math (sorry, but it's bedtime!), you're likely to save a decent amount in interest plus shorten overall duration to pay them off. If you can pay more over the minimum, that would decrease cash flow but would knock the loan out faster. About 98% its a yes, but you do want to do the math for the exact picture.