I was so happy to have been proven wrong by GO. With the tracking, it was ridiculous fun.
Now, with this patch, they have just ballsed everything up. Tracking is gone. Pokémon run a lot more often than they should (Had more yesterday than I had combined since launch), and aren't captured. Experience boosts are removed.
They've essentially made the game what I feared it would be, ridiculously bad, unfair mechanics to encourage purchasing of items.
They took the enthusiasm I had gained after being massively sceptical and have completely trashed it. I'm not having fun.
If they don't bring back tracking and sort the flee rates out, then this game will die off, and it will deserve it.
It is far from anecdotal... I have not in my GO play experienced this much fleeing and it's happening with everyone.