My biggest gripe is the IR pathfinder's artillery range. It is the main reason to build it, but you can't call it in without putting this fragile squad into harms way since it's the same range as their guns.
They basically need to walk into a bunker's mg to call it and will be never be able to use it against the flak HQ since it outright outranges them and will kill them before they can get close enough.
They need to increase it's range so you can use it to clear defenses. Otherwise you are better off just using the majors strike since he doesn't have to throw himself into gunfire to call it in.
The pathfinder artillery is FAR superior to the major's artillery. The range may be shorter, but the delay is short enough that you can pretty much guarantee that if a squad isn't immediately retreated it will die (especially if it's a setup team or in a building). It's honestly the one thing the doctrine has going for it.
Forward observer is good when you can get it to work. However, the conditions are too harsh that it's never practical. "In cover" seems to mean the entire squad has to be in cover.
I&R pathfinders are basically major squads. The doctrine description lies though. They come out at 3cp for some unfathomable reason. I'm also pretty sure they don't get the criticals airborne pathfinders get on their guns which is a shame.
Greyhound is an AI vehicle that can moonlight as light AT if it has buddies. It's part of why I always go captain. Either the captain squad maims the vehicle and the greyhound swoops in, or a stuart stunlocks the vehicle and the greyhound supports.
Recon sweep is recon sweep. The only thing in the entire doctrine that works as intended without any bugs imo.
Airdrooped combat group is simultaneously amazing and terrible. Recon Support Company is a very very very muntion heavy doctrine. Getting 180-240 muntions worth of squad weapons is a god send when you're up against the late game nazi horde. A discount AT gun isn't all that bad either. Paratrooper support squads have some bugs though. No veterancy description, they still only get 3 thompsons, thompsons don't give the sprint ability, and I'm pretty sure the fortification ability is different from normal paratroopers (might be intentional).