Guards rifles arent shit. They are good just not op as some claim because they saw a video and stationary tests.
Also that gaurd motor is nearly in everyone cmmd list indicating the doctrine is to strong according to some is silly. Every faction has a commander or 2 every one goes for.
Guard Motor is taken because of Mark Target and the T-34/85. It has nothing to do with Guards and more to do with the fact that the T-34/76 is basically an upgraded T-70/Ram Throwaway Machine while the T-34/85 can actually damage tanks. The Cost of the T-34/85 is also very good and its efficient for the stats that is has on the tank. Combine that with Mark Target and that is why Guard Motor has been a strong/meta pick since COH2 launched.
SU-85 is a good unit but it is a little clumsy due to the lack of a turrent. A player with less micro or even a map where SU-85 would be less ideal the T-35/85 with Mark Target can serve as a replacement.
Guard Rifle Combined Arms Tactics would be considered a "complete" commander with Guards in it as well yet it is
not Meta because the KV-1 is another Upgraded T-70 that is only really useful against infantry. It has Guards, a tank, some air strikes yet I rarely have seen anyone use this commander because compared to the T-34/85 the Kv-1 is light years behind and borderline buns especially after the nerfs it got.
On paper Guards are one of those units that are nice but in actuality are shit because they don't offer anything new that Soviets don't have access too already.
Penal Battalions come out sooner than Guards and thus will have veterancy compared to Vet 0 Guards. You can upgrade them and the AT Satchel is a good enough deterrent against dives that Vehicle Button is not needed.
What I am saying here is that the Soviet base kit is strong enough that it doesn't need Guards. It is not like USF and Pathfinders. Guards are not a bad unit but are worthless. Against a player with a brain, they are not going to let your Guards sit in prone for 30 seconds while they take you out. They will be hit with grenades, hit with mortar barrages, Stuka/Panzerwerfered or even air striked.
The lack of mobility make Guards an easy way to drain your MP when you can simply have other units that are cheaper and almost as effective.
This is why Airborne Guards are vastly superior. Not everything is about damage and 1v1 but more about how they fit into the army as whole. Airborne Guards are better due to the more mobile combat of COH2, and the Vet 1 air strike may not do alot of damage but it can force the enemy to move while your units are safely shooting at them.
Forcing movement is a very powerful tool when utilized correctly as a soft form of crowd control. Take for example a situation where you have a Maxim and it is getting flanked by an OKW blob. Normal Guards can't do much to help you accept touch the ground and await the anal pounding that is about to happen to your Maxims.
Meanwhile Airborne Guards with Vet 1 can force the enemy to move buying you time to reposition allowing you to hold the position or avoid a hard retreat back to base.
Guards in a sense are like Rangers. Both units have good stats and do well in combat but are not needed at all by the main armies who use them. I never once played a game of COH2 and thought to myself that having Guards would have changed the outcome of that game compared to Airborne Guards which could have actually helped me hold onto a vital point or VP due to the Vet 1 ability.