The Canon 7D Mark I was the camera that got me to seriously consider photography as an outlet of creative expression and deep passion.
It was a solid performer in all aspects, but did have flaws when it cam to low light situations, as expected for an older APS-C body. It's adequate autofocus and burst, with a generous buffer made it ideal for sports and fast action photography.
If there's one thing I learned from my 7D, it was that it kept me on my toes about being ready to adjust for the flaws it had... that is what made me a better photographer. The tool may have it's limits, but your imagination and intuition will overcome.