The whole Sight system is, politely said, very complex. There`s reason why there are a whole bunch of Tutorials about it. Not to mention all the Clans that specialized to introduce / teach new players ( and even experienced ) the ways of the Tank.
http://www.wotinfo.net/en/camouflage
That is a link to a site, where you can do checks on how the camo is for all tanks, when still, moving and firing. and compare them, not to mention when you spot other tanks ( and with what equipment )... very useful.
EDIT: In case you`re german speaking DEPAC as an example would be one of these Training Units.
The armor sadly is pretty much dead now, thanks to Gold ammo. Why bother to do the "Mahlzeit"-positioning on the E75, when any T7 can pen your Frontal armor with gold

( Deathstar 183 anyone? )
EDIT: Gold ammo pretty much made heavily armored Tanks ( like E100, Maus or T95etc ) obsolete. Afterall they can``t simply buy themselves some +50kph for a game or something, but do loose most of their armor vs Gold. But this is a heated discussion on it``s own.
Weakspot knowledge is essential. Equally essential is where what sits in a tank. ( Ammoracked an E100 with first shot recently?

) Knowing where to aim even gives lower TIer tanks chances to hit and damage bigger tier tanks.
http://www.wotdb.info/#country=ussr Click ont he Tank you like to view and click on the leftbottom of the new window "Vulnerability"
http://wotguru.com/weak-spot-guides/
And for a few tanks ( far from all though but very detailed about the armor stats and how angled )
Keep in mind you don`t need a huge Alpha to track a bigger tank. But keeping it from retreating behind a House/Rock can give your team some good chance of taking it out, esp TDs without turrets. And germans with their Frontal Transmission/Engine burn chance is just fundamental to hide. *cough* Tiger/Tiger2/JT
Learning how to sidescrap is a basic technique to know and master. Some heavy tanks like KV1/4 or Tiger 2 can use that to basically shutdown a whole road or path with the enemy having only little choice to counter it.
Generally all non Light tanks above T3 get a +2-2 ( so a T7 can be either TopTier with T6 and 5, or LowTier and face T8 and 9 and of course inbetween ). Light tanks get a +4 :/
I admit i haven`t played MWO for a long time now, so i do not know how complex it became but from the time i still played and comparing it to WoT: WoT is vastly more complex and to become very good in it will take lots of time not only playing but also studiing your tank(s), all other tanks, the mechanics etc.
You could write a alot more about it, but this should be just a brief intro.
And of course Anjian is right in what he says.
EDIT:
WoT was designed to give the most money f2p at T5. Below you do not enough damage ( the OpFor has not enough HP to do so ) and above the Gain is also getting smaller and smaller due to much higher Ammo costs and repair bills. Most can still get an ok Balance on T8, and do +-0 on T9. With prem you should have no problems to still gain money in T9 and be +-0 on T10. ( though i currently do +-0 on T10 without prem yet do - on T9

, damn you JT! )
http://www.noobmeter.com/
There you can check your stats and compare them to other players.
Edited by Stone Rhino2, 13 February 2014 - 10:10 AM.