I recall reading a complaint in Billboard magazine in the late '80s similar to what you are saying here, that nearly all the #1s of 1988 only stayed on top for one or two weeks, and that all of the ones that managed to stay on top for a second week lost their bullet.
But equally annoying (maybe even more so) was the long number one/short number one/long number one pattern of early 1982. Consider the following:
"Physical" by Olivia Newton-John (carryover from '81): long number one
"I Can't Go For That," Hall & Oates, short number one
"Centerfold," J. Geils Band, long number one
"I Love Rock & Roll," Joan Jett, long number one (broke the pattern! ;D)
"Chariots of Fire," Vangelis, short number one
"Ebony & Ivory" Paul McCartney/Stevie Wonder, long number one
Did anyone think "Chariots of Fire" really deserved to be #1?