Awesome observation-- they are basically exact opposites. The one potentially important thing to keep in mind is that, while both are casual (informal) words, "sucks" can be considered rude-- there are some situations where "rocks" might be inappropriate, but "sucks" might be genuinely offensive.

Yes, interesting opposites.

In this case yeah, it is the same.

Cool! thank you all!

Lol. I never thought of it this way, but sure, why not? I'd say you're spot on.