The Lee takes practice and map knowledge to use wisely. If you can hide most of the body using it's right mounted gun, it makes a pretty nasty corner hold. It's usually pretty fragile in close combat though.I'll add you but I try not to pester more experienced players. Just fun to chat up some matches and what not.
Something I would suggest to anyone, if you have an Android device (I dunno if it's on Apple) is to download the World of Tanks Knowledge Database. Then when you have some time to burn you can study the game anywhere. The piercing estimator can really illuminate how the armor works for some people.
Jlinker is probably being too generous with that assessment even, I think the stat guys told us that 48% is the win rate average. Anybody above 50% is doing solid in my opinion. Most experienced players won't shy away from anybody, the ones that do are the ultra tool-shed kind who spend every moment trying to inflate their stats by avoiding any scenario that might expose their skill as an individual. Some even go so far as attempting to game the auto-match system so they don't end up low tier.