The main reason why Soviets seem easier to play is because they have been out a lot longer than the OH has. People mostly know how to play Soviets. The players were able to see SU change over the years and adapt accordingly. Also, saying that Landsers aren't a valuable unit is a mistake from your part. They are just like rifles in role, get them to vet up, tech mp40s and you win every engagement really. Now, I am not saying that what we have now is perfect, but we are dealing with most concerns on the forum so you are likely to see some changes about them. Keep posting your concerns and we will see what we can do with them. Peace!
Put Expert CPU OST and SOVIETs and see who wins
You yourself already noticed that US also get access to their main infantry unit pretty early and do not need other infantry apart from them. Versatility isn't always a good thing. You need to know which unit types you want to focus on, else you'll get destroyed by concentrated enemy forces.
Also, I really doubt that soviets are easier to play than any other faction in the game. Afaik USA are way more easy to pickup and play than Soviets. Because you need to plan ahead as Soviet to win. You can't just spam conscripts and tech randomly and expect to win the game single-handedly.
While as USA you can just spam riflemen, get all their upgrades and wreck the enemy. As soviet you'll need a lot more to win. Support weapons, light tanks, heavy tanks, support infantry, main infantry + all their upgrades make soviets more challenging to play. At least that's my personal opinion on this matter.
Also, saying that Landsers aren't a valuable unit is a mistake from your part. They are just like rifles in role, get them to vet up, tech mp40s and you win every engagement really.