Gavinmad
Mr. Poopybutthole
Hell, in ROTJ they only engaged to hide from the Death Star laser. The Imp fleet was just a blockade.
One could also argue that they engaged the Star Destroyers at point blank range so that the Star Destroyers couldn't make use of their full firepower. While Star Destroyers did have a broadside capability, the vast majority of their weapons were fired frontally, as is evident from the wedge design instead of one that is more symmetrical between fore and aft. If we really want to get nerdy, aquatic races like the Mon Calamari would have a profound advantage in space combat due to being innately familiar with three dimensions, whereas terrestrial species have a natural tendency to think two dimensionally. So moving above or below the plane that a Star Destroyer was on, while in close proximity, would dramatically reduce the weapons they could bring to bear.
But then again, it was written by a guy who thinks that parsecs are a unit of time and that the Executor would IMMEDIATELY start listing into the death star after losing bridge control. Or that a ship the size of a super star destroyer wouldn't have redundant navigational controls. Or that the bridge/cic would actually be constructed in such a vulnerable position on the ship. Etc, etc.
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