SU85 is always nice to have, but I feel its a little expensive to go T4 for heavy AT, when the shermans main role is AT.
For me, I feel its nice to go really aggresive, with fast T34s, then shermans to back them up. This gives a really mobile tank force, with a little more bite than normal. And where Shermans begin to struggle, youve got ram on hand then. And yeah, Id back this with probably one ZiS.
Doing this makes great use of spare munis/ fuel ability.
Only the M5 call in is kind of a waste, but maybe its still worth it for the guards.
I couldn't disagree more, I've been using this doc for the past few days and I build scripts for early game, until 2cp and I get a Dshk or two. go t2 for mortars and zis, to provide some AT to make up for the slight delay in getting t4 armor out, Then I build SU-85 to fill the AT role. My shermans (upgunned with the 50 cal.) roll in front of the crew to draw out/engage panthers and the like and let the su-85(s) Do the heavy lifting.
I really dont see much of an advantage to building t-34 as they have the same caliber main gun (76mm), though im not sure about the game stats. It seems like a t-34 with more AI and less AT use due to lack of ram.
Also, the upgunned M5 is amazing and is constantly wiping the floor with infantry blobs. Nothing makes me happier than being able to chase down a shrekd pgren squad on retreat! I find the upgunned m5 useful throughout the entire game, they are a great way to protect your su-85s from pgrens and can also pop forward now and then to decrew enemy weapons and even lure in some enemy armor to SU-85 range.
tl;dr
I really like this doctrine, and M5 is awesome.