Fair enough, you like them, I find them a bit stinky, but are they essential viewing? One could argue that "Grail" and "Infection" are more essential.
"Legacies" is more or less a foreshadow of Delenn's problems with the Minbari and especially Neroon. It lasts up to early-to-mid Season 4. "Eyes" was the result of Sinclair's encounter with Bester in "Mind War". You can decide whether or not they were essential to you. They were to me.