I guess it's about the skill of your opponents. In the low levels most of you opponents are inexpierenced players. In higher levels this changes.
The bot does not seek cover when it takes damage.
The typical tactic "move out of cover a bit for a shot, shoot the tank, move back to cover till reloaded" ist not used by this bot. It will be torn to pieces if two tanks are using it.
I have over 10,000 battles on my main account that I have not botted on. I have numerous games where I have taken 6 or more kills and still lost the game. When I am platooning my win loss ratio is very good, when in general pub matches I can do good and still lose. WOT is a team game and to some degree your stats, especially win loss stats will reflect on the teams that MM gives you. Mind you I have just started botting on a second account as I dont have time to play both haha so my botting experience is fairly new. However I will say that at least in the first 5 tiers that I have ground through with Tank leader the win loss ratio is not that much worse than my main account. The other stats on survivability and hit ratio are horrible. I would expect that with a bot. I am not worried about stats I am just trying to grind through and get tanks to use later on (tier X)
I would think if performance stats are important to you than botting is not the way to go. Personally if the bot was so good that it outperformed 50% of human players I would be highly against it. It would take away from the game too much. When I see a bot when I am playing I just kill them, not report them. I believe most others do the same,, I don't want a super bot that takes away from the game.