General perfectionism aside, I don't actually recall what spurred me to use native-language voicepacks for Fegel-Alert, besides the necessity of replacing the default RA voices with something more immersive to the setting. The ensuing adventure has seen me going to some extraordinary lengths to obtain localized files for several popular computer games, and in the process I've made some interesting observations that I've indexed below for fellow linguiphiles:

Company of Heroes

CoH was the first game I mined by virtue of the Eastern Front mod for the original CoH, which I only later learned used the Russian translation of the American units and wasn't actually original work. Both German and Russian sets are mostly direct translations of the original English, albeit with less individual lines (usually due to redundancy). I haven't done extensive research, but despite several (possibly deliberate) misuses/mispronunciations in the English set, at least some of the German actors may actually be bilingual and did both. Although first credited as Maximilian Voss in Opposing Fronts, I'm told Oliver Strizel voices the Wehrmacht Commander—however the German-language VO appears to be a different person.

I haven't dug into CoH2 too deeply (yet), but I do know the English and Russian sets are done by different teams.

Red Alert 2

The German dub is a work of beauty: like the original English, each unit has a distinct personality. Sometimes they mimic the intonations, sometimes they bring a new flavour—the German Spy has a nervous undercurrent, the Engineer is an unassuming worker, et cetera... the voice for Tanya is a close match for Kari Wuhrer, and I'm still debating whether to go for a side-specific VO just to show it off. The crowning glory, Udo Kier does all of Yuri's lines, and I'm trying to figure out how to work him into the mod.

The Russian translation, by contrast, is basically a phone-in. The same person does almost all the voices in a matter-of-fact monotone, and even with Yuri's Revenge most of the units use the same 'default' template with hardly any variation to the individual replies. Even the few female voices are so flat they're barely worthwhile as placeholders. Whoever handled the localization did not have high QA standards.

Red Alert 3

As in RA2, the German voices match the originals in tone, even if they don't copy every line exactly. Between this and RA2, it allowed me to provide side-specific VOs for all the original RA units, including multiple 'generic' sets for ships and aircraft.

This time, the Russian dub is on par with the German, and in fact I like it more than the base game for one small-yet-critical change: whereas the English voices are frantic and/or overblown stereotypes, the Russian VOs are more controlled, replacing the mania with a quintessential Slavic tongue-in-cheekness—they actually sound like soldiers, not cosplaying tankies.

XCOM: Enemy Within

Expansion pack to the 2012 XCOM, it introduced multiethnic voicepacks for operatives and was recommended to me by Omega124 as a source for female Russian voices. (The adventure of trying to get the file to me inspired the mini-arc that touches off Fegel-Alert's Soviet campaign.) The lines are simple and straightforward, but there are enough variations that it doesn't get too repetitive, even when using multiple sets side-by-side.

Cold War Crisis

The mod for Zero Hour, not OFP. Totally original voices for both factions; some of the actors are a bit dodgy but at least it's not derivative. In earlier versions the Soviet rifleman was voiced by a Bulgarian; other than the unenthusiastic delivery most people probably wouldn't even notice, but the pronunciations were prominent enough to local ears that they were later re-voiced.

World in Conflict

I scouted this for the DYOS mod, mainly as a prospective source for the FWA. The most notable feature is that the VAs for the Soviet tactical aid missions are Russian natives and voice both English and the translated set. While the Berlin Spetsnaz from Soviet Assault sound bilingual, other units are radically different between localizations. The EU mixes British, French, German, Italian, Danish, and even Norwegian voices in English, though of these only French, German and Italian have official localizations. Interestingly, even in foreign translations the units will have at least one line or word spoken in their original nationality.