Was your C5 a convertible? A lot of problems can arise from convertibles. I wouldn't compare that to a hard-top.
I hear the Camaro convertibles are crap.
Not a huge fan of the F bodies as far as quality goes. My C5 was not a convertible but I also made double stock rwhp with less engine issues than my bolt on Cobra convertible. I have worked with or around Ford most of my adult life, and they break just like GM cars break.