The cold war IFVs look like they're a complete non-starter. They've got terrible modifiers against PMCs and armies (even after taking the reduced difficulty into account), and have a requirement where 50% of the players will need to meet all of the objectives in half of the allotted time (I'm guessing the allotted time is measured in days/weeks?) or the entire episode is effectively failed (I have no faith that enough players will be able to complete the "very difficult" additional objective).
The modern IFVs have a bit of unclear wording that will either make it one of the best choices or one of the worst ones. Depending on whether "at least 80 percent of players don't complete the objective in the allotted time" is taken to mean "at least 80 percent of players must complete the objective" or "the number of players that do not complete the objective cannot exceed 80 percent", the exact difficulty of this class will either be really high (the first interpretation) or potentially fairly easy (second interpretation). I hope it's the latter, but I suspect it's the former.
I'm a bit peeved that most of the high-tier light tanks (Stingray 2, XM8, Dragun, XM8-120, Anders, PL-01, K-21 XC-8, etc...) aren't available as choices, but I'm not exactly sure where they would end up if they were choices...