It would be more desireable of course if you had fewer jobs and it MAY, depending on your overall circumstances, be an issue or it may not. This will greatly depend upon the circumstances surrounding why you left each of the jobs posted. AND, I suspect it will also take into account you past military service as well.
In reference as to whether or not will it be a waste of time or not: the best person to ask this to really get a more accurate or better "feel" of your circumstances would be asking a recruiter at the PD BEFORE you apply! Hopefully, it will give you a better idea about where you'd stand concerning this issue.
Hope this helps...
--
Charlie
"Good and evil are present in this world, and between the two there can be no compromise" - President George W. Bush, in his farewell address to the nation.