Ah Leica discussions, as much fun as discussing the merits of artists you like and others don't, or vice versa.
OK, caveat, I own two M6 bodies, a 3f (present from my wife) and some lenses. I also own various other cameras, Nikons, Bronicas, Linhofs, plastic cameras etc. All get used for the purpose they are best for. I was interviewed recently and asked what camera I used and my reply was something like "the right one for the job" which is sometimes the one you have with you but lets not go into that. Anyway, does the Leica make me a better photographer/artist. I think that yes, but here is why, I like using it, it encourages me to use it, it feels great in my hands, I know it and the lenses I use backwards, and I feel I have a tradition to live up to when I use it, so I try harder.
Is it for everyone? Nope. I know people who work best with an slr, a view camera or a paint brush. Beside 95% of the photograph happens behind the viewfinder anyway.
Do I use it exclusively, heck no. Is it with me almost always, pretty much.
Is it the best camera in the world? Nope, because there is no such thing. And for anything over a 75mm focal length lens I go slr, but that's me.
Are the lenses great, yes, I can tell the difference when looking at my contact sheets between the Leicas and the Nikors.
My advice, get an M3 or MP, learn how to estimate exposure (good training) and a 35 mm and try it for a while. Worst comes to worst you either have to buy more ......, or sell it, for probably what you paid for it and get something else.