What makes an epic bossfight?

[Extra-Ordinary]

Soundtrack is really good although all it really does is add some atmosphere and make it cooler.
Other than that, I'd say if it REALLY is a test of the abilities you've acquired, it's a good boss fight.
At certain times, EVERY weapon and skill you've acquired will NEED to be used, that's a good boss fight for me.
Most Metroid bosses fit that bill pretty well, especially Quadraxis.

Not to mention he also has a kick-ass soundtrack.

 

[mattttherman3]

Not a good final boss you ask? Giant Shard. Fable 2

 

[josemlopes]

I like how they are in Dark Souls, they are just enemies that are fucking dangerous.

You kill them in the same way you do any other enemy so no QTE or repetition of the convinient hit that makes the enemy numb for a few seconds. They are just usually faster and stronger meaning that you really cant loose focus. Another game that does them well most of the time is Kung Fu Strike. Really fun (and hard) Kung-Fu game