If you watch top badminton players go at it you will probably get depressed about that, too, because it actually takes a lot of skill and practice. The easiest sport to excel at without much skill or practice is track, particularly the sprinting and field events. But for those you need speed and power.
If you're talking about easy in terms of least equipment required than its soccer because its played all over the world in the poorest countries. If you mean easiest as in least skill required than its probably volleyball. I never really played volleyball until 10th grade but it was fairly easy to me, maybe because I'm just athletic lol but who knows
This question is subjective. I find baseball to be the easier sport to me, because I'm naturally good at it and started playing at 4 years old. Honestly, practice doesn't make perfect unless you practice perfectly. If you have fun playing whatever sport then go ahead and play it no matter how good or bad you are.
i agree with you on badminton but tennis is also easy