I think the community has definitely gotten a lot better. Part of it is just time - the longer the game is out the more time the pros have to define the meta, test what works where, and come up with tricks - and that cascades down through the ranks.
More recently, I think their initiative to really bring their eSports to the masses over the last year or so - has created a big smoothing effect in the playerbases skill level. The difference between Challengers and Bronze a couple years ago was unfathomable, today, it's measurable (it's still vast, but it's not incomprehensible anymore). The reason is that more low ELO players (bronze/silver/gold), are watching their favorite champions being played by the best players in the world - they are picking up sneaky tricks, map strategy, champion identity within team comps, lane positioning, jungle clear and invasion routes, etc.
I've watched Silver ELO Azir mains who can comfortably Shurima Shuffle like Febiven or Easyhoon - that's new. The number of insec'ing Lee Sins has skyrocketed, etc. They might still be low ELO for other reasons, but they tend to pick up mechanics mostly because it's what they tend to focus on - and now they watch the best do it more, because it's more accessible than ever to them.
So ya, the community has grown much more talented