a helpful guide for how i handle the reactions:
♥: i like this
♦: i relate to this in a sad way
♠: i do not like this
♣: i don't really use this one
♥♠: i dislike this but in like a troll blackrom way?
i personally use the mediate reaction to mean like, either "i don't agree but i can see where you're coming from", or "maybe we can get on the same page with some more discussion". that sort of general vibe.