Burns is good though. He's beaten Rocky Martinez, Paul Moses, and Kevin Mitchell. All were Top 10 fighters at 130 or 135 when he did.
Burns is also Vazquez biggest test. Burns has beaten better fighters than Vazquez has, in my opinion.
Still....Vazquez has a tough style to look good against. Burns needs to make it a rugged fight, and smother Vazquez, make him as uncomfortable as possible.