anything that helps the community out is a great idea go for it you'll have the support of most of the community with you too just remember to remind people that playstyles are an important thing and yours and someone elses are never going to match perfectly together
This is absolutely true. Assuming the ranking system works half way well, then most people should have around a 50% winrate. If you have more, then you should move up in ranking. If you have less, you should fall.
I agree. I'm probably 80% or so but I've only ever played on this account so I'm slowly moving up to around 70.