Worst boss fight in the best games?

[LegitHyperbole]

Pajderman said:

I always thought Ramon Salazar from the original version of Resident evil 4 was a let down to play. Here is this giant parasitic monster and you spend most of the time on the floor killing spiders. 

While I agree, the worst fight in that game is the fish boss. What a frustrating mess that is to fight.