Well, 6th Sense is a bit of a misnomer, but they have to call it something. It is not some magical, silly or completely unrealistic skill. It just allows for your tank commander to be a bit more on the alert to possible danger. He realizes sooner rather than later if an enemy tank may have spotted him. Unlikely this ability keeps "...many others..." from playing the game though. Understand if you are not a fan of shooter games. That alone is more than enough to turn you away.
However, you do touch upon a point that is a problem and why many might well find the game off-putting. They WoT community is the most toxic I've ever experienced. Because of its shear size it generates a LOT of idiots and fools. I guess many players have so little going in their lives (or may well just be immature) they need playing WoT to bolster their self esteem. The way to do that is to be critical of the play skills of others or just simply misbehave in general. This, of course, is self defeating since to win a battle the team, consisting of 15 players, must win the battle together. I've found the best way to neuter this problem is to delete bad language and in some instances just delete the chat box all together. A thick skin is really the best remedy.