World of Tanks has it's problems. I don't play it much for these reasons:

1. No historical mode/battles.
2. No PvE.
3. Multiple guns don't work.
4. No hull upgrades.
5. No infantry or machine guns that work.
6. Only one mode - Random Battle ( if they have others, it's either for tier 10, or soon canceled).
7. No wheeled vehicles and Multiple Rocket Launchers.
8. The higher tier you go the less credits you get and higher tiers going negative even with premium. Higher tier more fun to play, but not possible to play with WoT economy.
9. It does not work on PS Vita and PlayStation 3.