I've been loving it. Finally got myself out of Tier 1 with the Stug III F but not had a chance to drive it yet.
Playing in Sim mode (not even tried the other 2) and I've found a few oddities - the T-50 is indeed very very strong. I'm also baffled how my upgraded "pay for in lions" ammo on the Stug III A which allegedly has 84mm of penetration can bounce 5 shots in a row off of a tank with 45mm of armour. I'm aware that angle also has an effect, but this happens WAY too much and yesterday I had 2 shots in the arse of a T-50 at < 20m bounce off at which point he turns round and 1 shots me in the front
Artillery isn't too bad as long as you stay mobile and choose the right times to move - i.e. when you've garnered too much attention. It looks like light tanks pretty much phase out at Tier 2 so I guess the higher level matches won't have it anyway.
Barring this stuff, I'm really loving it - much more WW2 Online than WoT which is what I wanted. Working my way to my beloved Jadgpanther (I have a 1/8 scale RC one with all the trimmings) but would also love the British tree to not be too far behind - Achilles would be my tank of choice on that one, a US M10 Wolverine but up-gunned with the Brit 17 pounder.