I'm very lucky that my group for the last 2 years was gathered from individuals largely new to RPGs and who I was able to mould and shape to my own meglomaniacal ideals.  Mwa ha ha ha ha ha! 
But seriously, it was just a stroke of luck that I showed up at the local gaming club with my books, some pre-gen characters, and an adventure, and some nice, balanced, pretty cool people showed up wanting to learn D&D.  No bad habbits to break.
I'm a crazy min-max savant, because I'm a mechanics-junky.  I like to pop the top on a system and each individual rule and look at how they interact with one another.  So all of my players got to see that you could do a lot of crazy crazy stuff with the core PHB, and that when introducing new rules, those new rules often interact with other things in ways not immediately predictable.
Which is why I'm a draconian monster of a GM when it comes to character creation and character concepts.  None of my core players are into being different for the sake of difference, and I tend to ask for concepts BEFORE accepting anybody into a game, and often forget to call people back when their concept is a Half-Dragon Minotaur Vow Of Poverty Monk.
--fje