Honestly, it's overrated. Yeah it's a huge collection, and it has Maus, but a lot of it is in pretty poor shape and the rest are just boring cold war prototypes that were never produced. Worth visiting if you really like tanks I guess, but make sure you learn Russian first, few signs are in English.
Absolutely worth a visit.
Why so? You can just apply for a visa (it'll be approved) and fly to Moscow. You'll need to withdraw and convert your travel fund to rubles before rather than just paying with your credit card, but so what, that's fiscally responsible anyway, Mastercard charge a tonne on currency conversions.
I know some of the more subservient yank vassals have banned flights to Russia, but you could just fly through a more reasonable country first. Like I had to leave Europe through Turkey last time, but that's not a big deal.