Now that we have 3 frames under our belts, there are some folks who feel that the design is unbalanced in favor of the VVS, centered mainly on the qualities of the Tu-2. In summary, my thought is that it is decently balanced, with the fighter set being about equal, the Tu-2 being better than the Ju 88, and the 190F being much better than the Il-2.
More details follow.
The Tu-2 is indeed an excellent bomber. But it is the only Soviet bomber in the game, was in main-stream use by late 1943 (being introduced into combat in 1942), and was used in significantly larger numbers by the Soviets than any other bomber we have in the game (such as the B-25). If we used only historical aircraft in this scenario, there would be fewer Tu-2's and more Pe-2's (which are actually faster than Tu-2's, so more Pe-2's wouldn't change that dynamic); and there would be Stukas and no 190F's. There is no Pe-2 in the game, though; and I don't think even I would want to fly Stukas for 4 frames.
Using the Tu-2 in this scenario is perhaps like using the Ju 88 in Battle of Britain before we got the He 111. The real BoB didn't have all Ju 88's -- it had He 111's and Do's as well, and there was much complaining about the Ju 88 being way too fast and powerful to be the only bomber represented. But once we did get the He 111, it turned out that it did about as well as the Ju 88. Also, in the case of Coral Sea, we use the TBM as the TBD, which folks have felt is much too powerful compared to the TBD. But the B5N in Coral Sea does about as well as the TBM.
At any rate, the balance of a scenario design is about how the whole plane set matches up. The fighter set, in my opinion, is about even, where I put the La-5 as the best (slightly), but the German planes better in a mix than the Yak's and P-39's (which aren't bad -- just not quite as good). I also think that the fighter set is decently balanced because kills were pretty even in frames 1 and 2, when sides had closer to even numbers. The Tu-2 is better than the Ju 88; and the 190F is significantly better than the Il-2. This based on my flying of La-5's, 190A-5's, 109G's, and *lots* of Ju 88's in scenarios, as well as significant P-39, Il-2, and Yak-7b in the MA. So, overall in my opinion, a wash.