As most have stated above, there are multiple variables when approaching a refinance. If you're the "best of the best" (740+ Credit Score, Under 60% Loan To Value, Under 45% Debt to Gross Income Ratio, $200k-$417K Loan Amount, etc.), then 5.375% would be considered a little on the high side. Even with No Closing Costs, many Lenders (including myself) can offer you a better rate.
There are also many different Programs with those you have less than 20% Equity (FHA, Fannie Mae Refi Plus, etc.)
With a little more info, I or any Loan Officer here would be able to give you an accurate quote based on your situation.
Best Regards,