As someone who hasn't played CoH2 since 2015, will this guide catch me up on the most popular commanders in the game?
I can tell that there are a few commanders not listed in the guide but I don't know if I should worry about it too much. There's so many it's a bit overwhelming!
Any suggestions for catching up?
No, this guide is very outdated, more than 50% is wrong.
Here's a quick sum-up of what you want:
Ostheer: A commander that provides an alternative to LMG Grenadiers like either Osttruppen commander, either Assault Grenadier commander, Infantry Doctrine or Jaeger Infantry Doctrine.
Soviets: Preferably a commander that provides early AT like Guards or the M-42, but at least provides strong anti-infantry like Shocks, Guards, Dshk's or the weapon crate drop from Airborne.
OKW: A commander that has either Panzerfusiliers for early snare, Jaeger Light Infantry for campy T1 play, Fallschirmjagers for harder snowballing or 221 if you're a good light vehicle player.
USF: Don't really need a commander as much, so you see more variety. Mechanized is good for applying lots of early pressure while still being strong late, Heavy Cavalry is for a more conservative safe style of play but with the best late game, Recon Support is for campy play with Pack Howitzers. Other good commanders are Urban Assault, the 1919 doctrines and - solely for the AT gun - Airborne.
Brits: Valentine doctrine is heavily favored amongst most players. Otherwise pick a commander that provides the utility you want or try Lend Lease for the Assault Sections.