This season is very obvious that they are putting chokepoints in matches, randomly deciding what comps will win or lose any given match, and setting you up for fail builds (if you play into the "what's dealt" meta), while not even trying to hide when they are forcing you to lose or boosting you to win.
You can see it in the matches when the game slates you as a definite winner, then slows wayyyyyyyyy down, and suddenly your 3v1 is defeated by a mega ult and crit that had not existed the entire match otherwise. You can see the game thinking "how am I going to pull this BS loss off?" it seems.
You can see it when the game gives you 3 tiles worth of a gold champ (that's 2 2-stars with 2 one-stars) while it ruthlessly denies you the final piece needed for the ENTIRE REST OF THE GAME. That locks you out of real estate you could use to flip your build, and it leads you on to believe you should hold pieces that you really wasted your time and gold and real estate on. I've seen this in SO MANY GAMES this season that it's beyond aggravating.
You can see it when the game figures you're on a certain comp, and then it withholds units from you to lock you out of the comp. I've had matches where, in one particular case regarding a nasus, I was going for a certain build, and I only needed one gray piece to finish the comp. Got every single other thing needed. Never even once saw that one-star nasus, ever, that match, ever.
But, I can sell a gray piece late game that I no longer need, and all the sudden, my market is flooded with that stupid card for the next 20 flips. Yeah, right.
You can really, really see it when you play a few games back-to-back, and at least one of the games, EVERY SINGLE FLIP is a completely different roster from anything you've gotten and anything you've farmed over and over and over. Hell, you can even build into common pieces trying to change your strategy, and then watch as your flips magically pull from anything but the pool you just went to. I've had several matches where I couldn't hardly get more than a couple of odd-mixed runes on the floor because the "random deck" was giving me everything but what I wanted or needed until I changed my mind, then it changed its mind and started giving me other stuff.
This season is pretty crap imo. The elemental buffs are also pretty silly. These things are not working cohesively.