I agree- the logos are not very eye-catching.
An amusment park logo should reflect a park's fun and excitement. The logo should be colorful, and each park should have a different logo. Six Flags, known for their chain-wide logo, is atleast colorful and exciting. I'm ok with the Cedar Fair "symbol" next to the names- but the fonts and colors should be different.
But again- I'm not the company that had the means to make a billion dollar purchase