Actually, you would be suprised. Jaeger infantry is an amazingly underused doctrine. The mg42 + camo is great, and when you upgrade your 3-4 grens with g43s, you can murder infantry that get caught in your suppression field. You need to rely on Paks for AT, but thats not really a problem nowadays with the new TWP.
Additionally, a PGREN with shrecks behind your paks will deal large amounts of alpha damage to enemy armor. To top off the power of the doctrine, you get the borderline OP Stuka CAS loitering strafe to murder enemy vehicles and support teams. It can easily shave quite a bit of health from an IS2 with engine damage or pathing issues.
Im really intrigued by use of this doctrine.
Would you build a muni cache?
Why do G43s in particular murder supressed troops in comparison to LMGs?
Would you normally tech to T3? Or hold the line until T4?