These games still have a unique graphical style that holds up today.
Final mix is still a fun game, but compared to what games come later it doesn't age well, the combat feeling stiff early on, the gummi ship sections are in their infancy with how slow and boring they are. But later the game picks up more with the more spells you get, your expanded roster of abilites.

RE:CoM is boring. I've never enjoyed it and I don't think I can, sadly.

2 Final Mix is an overall improvement to the first game, from combat, to movement, to environments, and the gummi sections are a lot more visually interesting (though still pretty simple). It falls off with certain worlds not being the most entertaining and lot of the later content being revisits to worlds you've already finished.

Birth By Sleep is a bit of fun too, though the movement/combat is sluggish and restrictive - there is a QOL mod that allows for animation cancelling that makes things less constrictive. Aside from that, the game is still charming like the rest.