While I liked playing crpgs of all kind the first crpg title I felt in love with was Fallout2.
Not saying previous games sucked, almost all were good, some were great, hell I can't remember how many times I played through Betrayal at Krondor which is one brilliant game for example.
But FO2 got me completely obsessed with.
It was two cRPG games for the Commodore 64 that I had rented from a mail order business in the mid-west - Dragon Wars and Pool of Radiance. Both were brilliant and got me hooked on the genre. I played them consecutively though I only had a week to play both before I had to return them so what I had to do was copy them using C64 nibbller software, and then I used my local library's copiers to copy the manuals and game protection wheel. It worked out well and I could take my time and finish both games (I'd say it took me about a month). The year was 1989.
Not sure if you're baiting meFor me, I'm not sure if it was The Fairy Tale Adventure (Amiga version) or Bard's Tale - as I played both around the same time.
I loved both of them to death - and I never looked back in terms of favorite genre.