For me I never played it BITD. I read about it but could never get my hands on it to rent back then, ever. A friend said he had it and we were going to do a round robin of play but then found he didn't have it. A friend of his was borrowing it.
When I did get to play any Mega Man game, I was underwhelmed. While this was many years later and I was pretty steeled against frustrating play, the game didn't do much for me. Compared to other games it felt a little dated, no scratch that, designed to be difficult for the sake of difficulty. As jb mentioned: you couldn't shoot upwards nor could you duck, basic staples of the genre. I never got far as the game didn't thrill me.