Oh, but Demon, Whizzer, American Eagle (especially red), Viper, Raging Bull, Fiddler's Fling and Lobster are most definitely worth your time if you are into fun rides! Great America is probably the best run Six Flags park and has the best VARIETY of any big park with both new, old and unique rides.
If you're just a creho have fun at Magic Mountain, Cedar Point and Great Adventure. For me, Great America is where it's at. No one has a disco tunnel and a 55 degree snapping drop on an old Arrow coaster that they just wanted to make steeper than Turn of the Century (the west coast Demon had it's drop changed in the 90s to make it more family friendly). If you want record breakers exclusively even though they aren't as much fun as other rides then have your other places that cater to that, there are many and they are popular in our community.
But do you! Do what you like.