How about Batman and Robin? Just look at the opening scene. Mr. Freeze robs a museum. Batman and Robin pop in and immediately have a hockey match with Mr. Freezes henchmen. Then Mr freeze escapes in a rocket ship that was somehow in the museum, and batman and robin hitch a ride on the ship. At very high altitudes, Mr. Freeze Jettisons and shoots his freeze gun at the ground to somehow soften his plummet. Meanwhile still in the stratus, Batman and Robin make makeshift surfboards out of the rocketship doors and surf down to the ground to somehow avoid being smashed on the Gotham city pavement. What portion of Captain America even remotely approaches that level of suck?
Here are some other of my honorable mentions for worst super hero flick of all time: Constantine, Catwoman, Spiderman 3, TMNT 3, My Super ex girlfriend, Abraxas: Guardian of the Universe, Steel, Superman IV, The Phantom, Robocop 3. Yeah, all crap.