There's always one dislike I've had for gigantic bosses: that they're gigantic. While they are pretty cool to fight and usual look pretty cool too, they're usually more of the....easier bosses to defeat, such as Fyrus, or Armogohma. That's really what I've found throughout the years, and why I've come to dislike, except for appearance.
Smaller, more humanoid bosses on the other hand, are almost always great battles. They challenge you, they make you really think about what to do and how to beat this guy, and it's almost like fighting a replica of yourself, and you have to combat all the moves you would make like in a real sword fight. Such battles like Dark Link, and the Darknut battle from the Temple of Time in Twilight Princess, those were real fights, and the ones I want to see more often.