You may be unable to play Multiplayer with players using the Russian or German depot. The solution: Keep a copy of your original language files on your desktop. If you want to play multiplayer ranked, swap back to your native language, play the match, then swap back to English for single-player. Conclusion: Is it worth it? Yes. Absolutely.
While hunting down the Total War Attila English Language Pack requires a bit of technical elbow grease, it unlocks the game as the developers truly intended it: bleak, terrifying, and utterly immersive.
If you have landed on this article, you likely own a copy of Total War: Attila that defaults to German, French, Spanish, Polish, Russian, or Italian, and you desperately want to switch it to English. Alternatively, you may have purchased a "CIS" (Commonwealth of Independent States) region key or a Multi-Language version that stripped out the English audio/text to save file size.