World of Tanks
Rolled out my brand new Panzer 4, and I got Top Gun (6 or more kills out of 15) with the D.W.2 (German heavy tank experiment). In lower tier games where there is less heavy armour the D.W.2 can do well, in higher tier games with more armour even the best gun on the D.W.2 has trouble penetrating even some light tanks, but I need to grind with this vehicle to research one of the VK tanks, and after that VK another VK (I think off the top of my head) and then the Panther. With the Panzer 4 I'm moving towards another kind of VK tank, and after that the Tiger.
With the British I'm still grinding with the Crusader for the Cromwell.
With the U.S I still have some fun with the Sherman "Easy Eight", and I'm grinding through for better upgrades on my T-20, and then I'll be grinding for the next tank, the M26 Pershing.