If you want a fun, unique, multiplayer game where you get to shoot other tanks, W.o.T. is right for you!
Most people I've seen just free lance on their own time but once you get into higher tiers (based on your tank, equipment, xp, etc) , more people will be in crews, have better tanks, and be more agressive. It takes time unless you are willing to pay money for certain items, but F2P players aren't left out of the fun as it's easy to get a good tank fast.
All in all, World of Tanks is a good game and is enjoyable for just about anyone.
Final Rating: B --- 8.5