OKW have the most AT options in game... They have a Rak in t0, a Shrek for sturms, a puma in mech truck, a jp4 and a panther. You have AT for whatever flavor you want and whatever fuel budget you have. Use your camo raks against TDs that they are guaranteed to pen, not the heaviest armour the allies have...
Most AT options doesn't translate to best AT options though. Sturm Shrecks are god-awful, and it's extremely rare to see good players use them.
Raks are honestly useable only because of the cloaking gimmick, but have pathetic range, a hyper-exposed crew, and simply atrocious stats for an anti-tank gun. I hate facing cloaked AT guns as much as the next dude, but when playing OKW I really wish I could just have a PAK40. Raks get outranged by Allied TDs, and die so often because they're 10 range closer than every other AT gun. It's a weird, cheesy, unit that performs poorly in its intended role and overperforms in situations where you can abuse its awkward mechanics. Also, you're emphasising "T0" rak like it's an actual benefit. T0 rak is to make the game actually playable. You've conveniently forgotten that no Allied faction needs to face UC/Clown Car - if they did, they would be wiped off the map in 5 mins unless they got T0 AT as well.
Puma and JP4 are both great vs mediums, but both suffer from having very low pen. Design-wise, Allies generally don't have much heavy armour, so the Axis repertoire naturally didn't include many units with high penetration. This actually makes it very difficult for OKW to deal with heavy armour - and it's why Spec Ops is so insanely good. It gives a legit Pershing/IS2 counter to match those heavy call-ins. If you don't go Spec Ops, T4 + Panther costs will require too much fuel, and the IS2 call-in with 375 armour will steamroll your low pen AT options. Having the most AT options doesn't mean much when none of them have even 200 pen. To get a stock Panther out vs the IS2 requires the OKW player to have approximately a 100 fuel lead, and even then a Panther can't brute-force its way to a win vs the IS2, since it gets badly demolished in a straight-up brawl with the IS2.
The three Allied factions all have a 60 range AT gun and a 60 range 220++ penetration tank destroyer each, which they need because Axis vehicles have more armour. The OKW AT department is very comfortable vs medium armour but generally struggles vs heavy armour, and the Panther's shorter range makes it easily zoned out by AT gun walls.
One of the few situations where I'd say ulu is making a valid point, and I agree with him on this issue. The reason most players don't notice this issue is because Spec Ops covers for this OKW weakness perfectly, and the CP5 has OP sight range so it feels as if OKW doesn't have any anti-tank issues. If we nerfed CP5, the faction would easily be overwhelmed by Pershing and IS2 call-ins.