The Lizalfos are easily my most hated foe (outside any of the Bosses) from Skyward Sword. They were constantly dodging and blocking my attacks, even when I thought I had them. The way they were developed to fight must have been why I had such a hard time with them. Lizalfos are extremely active for a standard enemy, and thereby differ from the usual brand of adversaries that Zelda gives us. They may have shorts swords, but their shields are big enough to escape damage from any weapon that Link could use to bring them down immediately. As such, they challenged my quickness and reaction time more than any other SS foe, and by themselves they probably reduced my hearts more than their compatriots. Considering all this, they're not only unlikable, but also vexatious to my playstyle.
Either that or every other foe was overly easy. :/