As somebody who's been grinding through World of Tanks for several years, the upgrade path/costs really don't bug me in this game the same way other people seem to be bothered. Most of my matches in WoT are Tier 4-7, because that earns me credits for the more expensive high-tier matches and equipments, and I have a lot of fun doing it. Even very good WoT players are used to losing money on their Tier 10 matches, because the entire point is to push players to spend time in the lower tiers, while also giving them a goal to shoot for (Incentive, meet Reward). This is why WoT puts the best cost-to-earnings ratio on the middle tier vehicles.
I just wish there was something I could do with all of the XP my recruit ships earn while I'm playing them for credits. In WoT, even low-teir tanks can put excess XP towards crew skills (although it takes FOREVER). When I do spend real $$$, it's going to be on decoration, not converting Tier 1-2 XP into free XP.
I hope they address the more serious bugs first, and then go back and tweak the economy maths.
Does anybody besides me use custom key bindings? Almost every match I need to reset my control preferences. (I use a trackball mouse that has both mouse keys under my thumb, which makes Zoom unusable in the standard control scheme)