Judy first saw use in Recce at the Battle of Midway. From 1942 on, she was the premier divebomber of the IJN. Although her bombload was the same as the Val, she was considerably faster than any other Carrier born divebomber of the time (of course, the USN JABOs render this pointless during the course of the war).
In 1942-1943 events, Judy would give the Japanese a much needed strike platform that would be able to actually make it to the target, and have a decent chance of getting home. As it stands, flying Vals v. Hellcats and Coursairs is less than useless.
Granted, there wouldn't be much use in the MA.
-Sik