I play WoT and as stiz says free to play and upgrade but quicker with cash! Although the community seems somewhat negative to the so-called 'wallet warriors' lol! It's good fun, controls are arcade but the physics and ballistics seem reasonable for what it is, just takes FOREVER to earn the experience required to research upgrades and new tanks in the Tech Tree.
You get the usual whiners and guys who take it far to seriously and make rude comments at what they perceive as noob behaviour, but they are a minority.
All told I enjoy it, it's a great game for playing tanks without getting into a full-on sim!