Every CCI that I can think of was tracked very well when it was built, so when each one opened I'm sure they were all very smooth rides. How they run today is determined by how well the parks took care of them. There are a lot of rough and smooth CCIs, but most I have ridden are very smooth rides.
As for GG, Hades is a very smooth wood coaster. It may not be as smooth as Cornball Express or Timber Terror for that matter, but its probably the smoothest wood coaster operating that is it's height or larger.