I have shot a flintlock <40 shots total.
The thing that sums flinting up to me is maintenance. Treat the gun like it is equivalent to the beating of your heart or the air that you breathe. Every day that you fire the gun you should take down the gun, clean it thoroughly. adjust and test the flint, maybe knap the edge or replace it, all in all total inspection and adjustment, so that the next time you go to fire the gun it is in prime operating condition. Once you do this a few times it becomes second nature. Our forefathers knew that their lives depended on the gun to fire when called on and took this responsibility very seriously. Modern centerfire rifles and modern smokeless powders have spoiled us. You could conceivably shoot a modern day gun your whole hunting career without ever cleaning or adjusting it, and it would function well enough to kill something. This is impossible with a flintlock. A flint shooter should make his gun like new after every shooting session. If you clean and maintain it properly, making necessary adjustments and testing of function and obey some fundamental rules, you should go "bang" every time. As for comparing them to inlines, just a little more dedication involved. They are just a different variation of the same tool. The inlines have a few technological upgrades that remove a little (not much) of the attention needed to be reliable.