So, let me see if I can sum up the argument so far...
Side 1: "No fair!! The Germans always get shafted!!!"
Side 2: "No fair!! The Russians always get shafted!!!"
Maybe the TRUTH of the matter is that NEITHER side gets shafted, and that BOTH sides have advantages and disadvantages, many of which depend on the map, engagement ranges, and the respective strengths and weaknesses of the various equipment.
For example, for those who are kvetching about how "Germans get pwned on Arad", bear in mind that Arad is essentially a "close quarters" tank map. Engagement range is, on average, about 500m -- close enough for BOTH sides to penetrate each others' armor with relative ease and CERTAINLY not long enough range for the German armor to capitalize on some of its major advantages (IE: long-range penetration, a.k.a. "powerful" guns, and precise optics).
For those who are complaining that the Stug is too weak, consider the soviet equivalent -- the SU-76. I think most people know the weaknesses of the SU-76, so I won't belabor the point.
For those who want an MG added to various vehicles, bear in mind that we don't have a lot of the MGs available because NO AFVs in the game have the AA MG mounted. None of the soviet AFVs, none of the German AFVs. Nobody's got 'em.
The game is balanced enough, and every variation of each side's armor is simply not going to be created by Tripwire staff. Get over that fact and get on with your lives. If the lack of these various vehicles is so offensive to your sensibilities, by all means, get out there and start making your own models, skins, and code to rectify the situation. We've already got mod teams putting together entirely new AFVs (IE: Mare Nostrum, Berezina's BT-7 prototype), so it's certainly possible.
There are FAR more pressing issues to address with respect to armored combat than adding yet another German variant, adding MGs to the cupolas of the various vehicles that had them, and adding this or that weapon or whatever.
I'd rather Tripwire focus its art department on creating new maps that allow for a wider range of gameplay, or add new models that expand the feel of gaming (IE: early war AFVs) rather than simply tread over the same well-established ground. That's not to say there shouldn't be minor tweaks and bugfixes, but honestly, so many of the requests people make just don't seem to be anything that'd really add all THAT much to gameplay or expand our experience as players in any really significant fashion.