@Nerd, I think he meant Boku no Hero Academia.
For Spring anime, Re:Zero gets enough hype as it is. I enjoy it myself too...But I'll go with Tanaka-kun wa Itsumo Kedaruge and Flying Witch. With all the action packed animes, seeing these relaxing, slice of life animes just brightens the mood and they make up for many anime flops that season.
As for the animes in the Summer season, none of them makes me go "I WILL LIKE THIS" right now. Too early to judge with majority of the anime out only getting 1-2 eps out as I post this - with the exceptions of ReLife.