You are correct with the records, but way off when it comes to context. Schiano took over the worst program in 1A (and worse than many 1AA teams), so his first 2-4 years should get some sort of pass. Even if you just take out his first 2 years, his record goes to 65-47 and improves to 70-48 (59%) when you throw in the 5-1 bowl record. That's not too far off Burns's 64% winning percentage and Burns inherited a very good team that went 7-4 the year before he took over (and had only 1 losing season in the previous 5).
Personally, I look at them as about even with regard to football success and I never understood why we fired him. However, Schiano gets the nod for me as far as being a program builder, given the incredible growth of the program and the expansion of the stadium, all of which were directly responsible for us getting the B1G invitation. Burns can't claim anything like that.