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The T-43 is a Tier VII russian medium tank.
To summarize that tank up:
Its gun is not that good (same top gun as on T-34-85), hull armor is basically not existent (lucky bounces with angling might occour) and its agility is average.
Though its turret can be really troll but don't rely on that.
You should always carry some premium rounds with you. The gun has with normal AP ammo just 144mm penetration. Average damage is also kinda average with 180.
One of the good things about that tank: Its DPM. Its awesome! If you can penetrate a target and your target is on open ground, you'll cut health away like nothing.
ROF is 11.11 rounds per minute.
Gun depression is also kinda good for a soviet tank.
If its top tier it performs quiet good, on the bottom line of the matchup you should choose your targets carefully.
More information:
http://wiki.worldoftanks.com/T-43