Hey Raigoth,
The Lenin is at its strength in medium to close range engagements. The long range accuracy suffers because of the weakness of the dispersion at long range. You really want to get yourself into a position that you can control the engagement at medium range. You can definitely hit shots at longer ranges but you will not be able to do this as reliably as BBs from other nations. The major advantages that the Lenin has going for it include: 3 forward facing turrets, good bow armor and the ability to tank decently.
Tips:
Positioning is important with the Lenin because of the turret arrangement. Make sure you are angling correctly and you will be able to fire your front 3 turrets effectively.
The AA on the Lenin is not that great, so keep that in mind when you are positioning. You may want to stick within range of some help.
Take advantage of its bow armor when you are engaging other ships, don't really show side or it will hurt =).
These are just some broad tips to help you, playing the ship is the best way to learn how to get proficient in it. The Lenin does have a lot of strengths but some clear cut weaknesses as well. Good luck and let us know how it goes!