Might be a little late on this post but hey, might aswell get my say on this.
I think that Section Formations in a COOP game is pretty much useable "sometimes" (Meaning it can be used in some situations such as a defensive position using arks of fire etc) but overall in every COOP game its kind of pointless as of all the reasons above this reply.
What needs to be focused on more instead of formations is the Section Spacings. Think about it, If you was a bot or let alone an enemy player and you see an orgy of infantry in one cramed space. You would obviously pull out your trusty boom kit and throw it at them and watch all the kill counts rise...
I have seen countless moments of our infantry sections getting wiped just because of this issue.
If you're a section commander then I suggest you always watch where all your lads are, and If they are having some sort of orgy cramed together then give them a little bollocking and tell em to space out abit. I expect some people to say "Oh yeah I do that all the time" Yeah I do that all the time too, but sometimes It still happens anyway so personally we need to get our shit together especially as a squad leader. of course there are some brilliant squad leaders who know their shit. but obviously there are others who don't have as much self disipline as others. and anyways, of course, nobody is perfect
Maybe we should introduce some sort of training sessions for squad leaders on the server (Maybe a special event on just that?)
Its not the riflemen and the specialists issue, its in fact the squad leader, Because they are the ones who lead them to victory as they say, so they must instruct and organise his/her fellow comrades so that their infantry section can have the advantage in a firefight. and getting the spaces sorted out is one of the steps.
Oh and P.S
I might make a new post on the forums about something like this probably to do with "Squad Tactics and Formations to gain the advantage in the firefight"