I'm a PC/Mobile player, and I think the latest PVP system is decent now that they have ironed out many of the bugs and numbers. It has far more variety than it used to when it comes to foes.
It takes me 30 matches to reach tier 1. I only take the hard matches (3 trophy). I don't know anyone that plays casual. I'm sure there are people that play it. But, to me, I wouldn't bother with it because the rewards are soooo low in comparison with ranked PVP. It's laughable really.
As for the leaderboard, just ignore it if you aren't interested in it. Some weeks I rank on the leaderboard because I have way more free time. Other weeks, I don't bother with it.