The Ostwind isn't really bad, there is just no reason to get it as Ostheer. Much more effective to just wait the 20 fuel to get a P4 that is good against both tanks and infantry than something that is useless against tanks and sometimes effective infantry.
A manual reload is required from the unit; the biggest problem is the long reload time starting after the first shot if you've been in an engagement before. Having to attack ground to cause a reload is a pain in the ass.
Another good idea for allowing players to control and alleviate the Ostwind's drawbacks.